JP2016004516A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device capable of suppressing power consumption of a control circuit in a case of reconnection to an external device to be accompanied by initial processing in a state in which the electronic device continues to be connected to the external device.SOLUTION: If detecting USB connection to a host device while a power switch is turned off, a control circuit of a printer performs first initial processing (enumeration) for requesting bus power (in S14), and charges a battery with second power (in S15) upon completion (success) of the first initial processing. If the first initial processing fails (NO in S14), the control circuit does not charge the battery (in S17). If the printer is to be reconnected to the host device in a state in which the first initial processing is completed and the printer continues to be connected to the host device (S26, S28), the control circuit performs the first initial processing and charges the battery upon the completion of the first initial processing. If the printer is to be reconnected to the host device in a state in which the first initial processing fails and the printer continues to be connected to the host device, the control circuit does not perform the first initial processing and does not charge the battery (S17).

Description

  The present invention relates to an electronic device that establishes communication with an external device such as a personal computer (PC) and receives power supply from the external device.

  For example, in Patent Document 1, when a USB terminal unit is connected to a host device (an example of an external device), a mobile phone is an example of an electronic device that charges a battery (a rechargeable battery) by supplying power from the host device. It is disclosed. This mobile phone starts initial processing (enumeration) by transferring data to and from the host device via the USB terminal, and charges the battery with the first power (for example, 100 mA in current value). Do. When the initial processing is completed within a predetermined time after the USB terminal unit is connected to the host device, processing based on the initial processing is performed. On the other hand, if the initial processing is not completed within a predetermined time after the USB terminal unit is connected to the host device, the battery is charged with a second power (for example, a current value of 500 mA) larger than the first power. .

JP 2012-203765 A

  By the way, when charging is performed when the electronic device is powered off and connected to the host device via USB, the CPU constituting the control circuit uses the first power to the host device in the initial processing (enumeration). Configuration information called a descriptor including a large second power request and class information (for example, a printer class) is transmitted. If the second power can be supplied, the host device transmits an initial processing completion notification for notifying the setting of the configuration information to the electronic device. The electronic device can be charged by receiving the supply of the second power from the host device after receiving the initial processing completion notification and completing the initial processing.

  However, the host device may not be able to supply power with the second power requested from the electronic device. For example, the host device and the electronic device may be connected via a hub that operates on bus power. In this case, even if the electronic device transmits configuration information called a descriptor including the second power and class information in the initial process, the host device recognizes that the power supply via the second power is not possible via the hub. However, the configuration information is not set. For this reason, the initial processing completion notification (setting completion notification) for notifying the setting of the configuration information is not transmitted from the host device to the electronic device. As a result, the electronic device waits for an initial processing completion notification that is not transmitted from the host device, and the CPU is left in an activated state.

  For example, when the host device is driven by a battery, in order to suppress power consumption, there is a case where power supply is permitted only with the third power less than the maximum supply power (for example, a current value of 500 mA). When the second power larger than the third power is requested from the electronic device to the host device of this type, the host device cannot supply power with the second power. In this case, the initial processing is completed from the host device to the electronic device. Notifications are not sent. For this reason, the electronic device waits for an initial processing completion notification that is not transmitted from the host device, and in this case, the CPU is left in an activated state.

  Incidentally, in the electronic device described in Patent Document 1, the host device and the electronic device may be reconnected in a state where the connection between the host device and the electronic device is continued. For example, when the battery is fully charged while the power is off and the communication is cut off, the remaining power of the battery falls below the threshold due to the discharge and needs to be recharged. For example, when the communication is interrupted to stop the USB charging, the power adapter is removed and the USB cable is reconnected to start the USB charging again. Another example is when the host device and the electronic device are continuously connected, and the power source is switched on / off and reconnected. When the power is turned on / off, when the electronic device is a printer, for example, the class of the device device recognized by the host device is changed from the power-off class (for example, HID class) to the power-on class (for example, printer class). The host device and the electronic device are reconnected to perform the initial process of switching to (1).

  At the time of reconnection using these as an example, initial processing is performed between the host device and the electronic device. However, the electronic device described in Patent Document 1 includes a request for the second power every time reconnection is made. Initial processing will be performed. For example, even if the initial processing performed before reconnection cannot be completed within a predetermined time for some reason and fails once, a request for the second power with a high probability of failure is issued to the same failed host device. Perform initial processing including. As a result, an initial process that fails with high probability must be performed and a predetermined time must be waited until the failure occurs, and electricity is wasted by the control circuit that executes this kind of useless initial process.

  Note that the above problem is not limited to electronic devices such as mobile phones and printers (including multifunction devices), but also host devices (external devices) such as scanners, projectors, digital cameras (imaging devices), and audio devices (acoustic devices). ) And the electronic device are reconnected in a state in which the connection is continued, and is generally common in the electronic device that receives power supply from the host device.

  An object of the present invention is to provide an electronic device capable of suppressing waste of electricity of a control circuit when reconnection with an external device is performed with initial processing in a state where the connection with the external device is continued. There is.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
An electronic device that solves the above problem includes a communication circuit that is connected to an external device to perform communication and receive power supply, a control circuit, and a power switch. The communication circuit is connected to the external device in an initial state. In this case, the control circuit performs a first initial process, receives power supply from the external device after the first initial process is completed, and fails in the first initial process, the external device When reconnecting to the external device in a state where the first initial processing is completed and the connection with the external device is continued without receiving power supply from the first, the first initial processing is performed, and the first When power is supplied from the external device after the initial processing is completed, and the first initial processing fails and the connection with the external device is continued, the reconnection to the external device is performed. Performs the first initial processing It receives no power supply from the external device. Here, the initial state refers to a state in which the first initial process is set by the initial setting.

  According to this configuration, when the communication circuit is connected to the external device in the initial state, the control circuit performs the first initial processing, and receives the power supply from the external device after the first initial processing is completed. On the other hand, when the first initial process fails, no power is supplied from the external device. In addition, when reconnecting with an external device in a state where the first initial processing is completed and the connection with the external device is continued, the first initial processing is performed, and after the first initial processing is completed, Receives power from an external device. On the other hand, when reconnecting with an external device in a state where the first initial processing fails and the connection with the external device is continued, the first initial processing is not performed and no power is supplied from the external device. Therefore, when the control circuit reconnects with the same external device that has once failed in the first initial processing, it is possible to suppress waste of power due to performing the first initial processing.

  In the electronic device, when the connection to the external device is interrupted after the connection to the external device is interrupted, is the first initial process completed or failed before the connection to the external device is interrupted? Regardless, it is preferable to return to the initial state and start the first initial processing.

  According to this configuration, when the control circuit is connected to the external device after the connection with the external device is interrupted, the initial state regardless of whether the first initial processing is completed or failed before the connection is interrupted. Returning to step 1, the first initial processing is started. Here, when the connection with the external device is interrupted and then connected with the external device, the external device that is the connection partner may be different from the external device before the connection is interrupted (the first initial process was successful) there's a possibility that. In this case, the initial state is returned to the initial state. If the first initial process is successful, even if the first initial process with the external device connected before the connection is lost has failed and the power supply from the external device has not been received, It becomes possible to receive power supply from the apparatus. For example, although the connection with the external device that failed the first initial processing may be lost and the next external device connected may be different from the previous external device, the first initial processing is not performed and the external device It is possible to avoid missing the opportunity to receive power supply.

  In the electronic apparatus, the control circuit performs the first initial processing as the first type device when the power is on, and the second type device different from the first type device when the power is off. It is preferable to perform the first initial processing.

  According to this configuration, the control circuit performs the first initial process as a first type device (a first class device such as a printer class as an example) when the power is on. On the other hand, if the power is off, the first initial processing is performed as a second type device (for example, a second class device such as a human interface device (HID) class) different from the first type. Therefore, the external device recognizes the electronic device that is the connection partner as the first type device when the power is on, and treats the electronic device as the first type device. On the other hand, if the external device is in the power-off state, the electronic device that is the connection partner is recognized as the second type device and is handled as the second type device. Therefore, it is possible to avoid inconvenience due to misidentification that the connection partner in the power-on state is handled as the second type device or the connection partner in the power-off state is handled as the first type device.

  In the electronic device, when the power supply is on and the first initial process fails, the control circuit performs a second initial process including a request for power smaller than the first initial process, and the second initial process. When reconnecting to an external device while the connection is completed and the external device is still connected, if the power is on, the second initial processing is performed without performing the first initial processing. Is preferred.

  According to this configuration, when the power is on and the first initial process fails, the control circuit performs the second initial process including a request for power smaller than that of the first initial process. When reconnecting to an external device in a state where the second initial processing is completed and the connection to the external device is continued, if the power is on, the second initial processing is not performed and the first initial processing is not performed. Process. Therefore, it is possible to suppress the waste of power of the control circuit by performing the first initial process in which the control circuit has failed once on the external device of the same connection partner, and to process early after the reconnection as much as the first initial process is omitted. Can be started.

In the electronic device, it is preferable that the control circuit determines that the first initial process has failed when a timeout occurs in the first initial process.
According to this configuration, the control circuit determines that the first initial process has failed when a timeout occurs in the first initial process with the external device. Compared to a configuration that waits until the completion of the first initial processing without considering timeout, the second initial processing can be performed earlier, so that communication between the external device and the electronic device can be established earlier.

In the electronic apparatus, it is preferable that the control circuit determines that the first initial process has failed because a signal that should be periodically transmitted from the external device is not transmitted.
According to this configuration, the control circuit determines that the first initial processing has failed because a signal that should be periodically sent from the outside is not sent. Therefore, when it is determined that the first initial process has failed, the second initial process can be started early. For example, it is possible to cause the control circuit to start the second initial process relatively early at the time of the failure of the first initial process as compared with the case where the occurrence of the timeout is determined to be the failure of the first initial process. For this reason, communication between the control circuit and the external device can be established relatively early.

  In the electronic device, it is preferable that the control circuit sets the timeout time used when determining the timeout as a value when the power source is in the on state is shorter than a value when the power source is in the off state. .

  According to this configuration, the time-out time is set so that the value when the power is off is shorter than the value when the power is off. Therefore, the frequency of receiving power supply from the external device can be increased in the power-off state, and the start delay of processing instructed by the user from the external device can be suppressed short in the power-on state.

  In the electronic device, it is preferable that the control circuit sets a time-out time used when determining the time-out when the power is off according to the time required for starting the external device.

  According to this configuration, the control circuit sets the timeout time used when determining the timeout according to the required startup time of the external device. Therefore, when the other party to which the communication circuit is connected is an external device, even if the external device is in the middle of starting, the first initial processing is performed with the started external device to supply power from the external device. Can receive.

  The electronic device includes an operation unit operated for data input, and a timeout time used when the control circuit determines occurrence of the timeout may be set based on an operation of the operation unit. preferable.

  According to this configuration, the timeout time used when the control circuit determines occurrence of timeout is set based on the operation of the operation unit. Therefore, it is possible to set an appropriate time-out period suitable for the user's usage environment (the time required for starting the second type device used). For this reason, a timeout time that is too short that does not match the startup time of the external device is set, so it was determined that a timeout occurred during startup of the external device, and power could be received from the external device. Regardless, it is possible to reduce the inconvenience of being unable to receive power supply from an external device. Therefore, the frequency of receiving power supply from an external device can be increased.

  In the electronic device, the control circuit acquires the required startup time from the external device connected via the communication circuit, and sets a timeout time used when determining the occurrence of the timeout according to the required startup time. It is preferable to set the value to

  According to this configuration, when connected to an external device, the control circuit acquires the required startup time of the external device and sets a timeout time corresponding to the required startup time. Therefore, it is possible to set an appropriate time-out time that matches the user's usage environment (time required for starting up the external device to be used, etc.). Therefore, due to the use of a too short timeout time that does not match the required startup time of the external device, a timeout occurred during the startup of the external device. Nevertheless, it is possible to reduce the inconvenience of not being charged because the failure was made a little earlier. Therefore, it is possible to increase the frequency at which the electronic device receives power supply from the external device.

  In the electronic device, the control circuit measures a value indicating the remaining amount of the battery or a change in the remaining amount, and if the value indicating the remaining amount of the battery or the change in the remaining amount exceeds a threshold value, the initial process fails. It is preferable to judge that.

  According to this configuration, the control circuit determines the failure of the first initial processing when the value indicating the remaining amount of the battery or the change in the remaining amount exceeds the threshold value, so that it is not necessary to use a timer such as a timer. Alternatively, the failure of the initial process can be determined without monitoring the signal that should be sent from the external device.

  In the electronic device, the battery is charged with power supplied from an external device. According to this configuration, the electronic device can charge the battery with the power supplied from the external device.

FIG. 2 is a schematic diagram illustrating an electrical configuration of a printer and an external device according to the first embodiment. The sequence diagram at the time of the initial process success of a host apparatus and a printer. The sequence diagram at the time of the initial process failure of a host apparatus and a printer. FIG. 3 is a schematic diagram illustrating an example in which a host device and a printer are connected by USB via a hub. The schematic diagram which shows the display part in which the mode setting screen was displayed. (A), (b) is a schematic diagram which shows the setting information memorize | stored in a non-volatile memory. The flowchart which shows the main routine of the charge process at the time of a power supply OFF. The flowchart which shows a charge process routine. The flowchart which shows the initial process at the time of a bus power request | requirement. The flowchart which shows the USB communication process at the time of power ON. The flowchart which shows the initial process at the time of the bus power request | requirement in 2nd Embodiment.

Hereinafter, an embodiment of a printing system will be described with reference to the drawings.
As shown in FIG. 1, a printer 11 (printing apparatus) as an example of an electronic device functions as a USB device 11A (see FIG. 4) based on the USB (Universal Serial Bus) standard. The printer 11 shown in FIG. 1 has a USB connector to which a connector 35A (terminal) is detachably connected in order to be communicably connected to a host device 30 functioning as a USB host 30A through a USB cable 35 which is an example of a communication cable. 12 is provided. The USB connector 12 includes power supply lines (P, G) as power supply paths and data lines (D +, D−) for transmitting and receiving data. When the connector 35 </ b> A of the USB cable 35 is connected to the USB connector 12, the same poles of the data line and the power line are connected to each other, so that data transmission / reception with the host device 30 and power supply from the host device 30 are possible. The USB connector 12 has an electric circuit for communication including a power line, a data line, various elements (for example, resistors), and the like. In this regard, in this embodiment, the USB connector 12 constitutes an example of a communication circuit.

  The host device 30 is configured by, for example, a personal computer (PC), but may be a computer such as a personal digital assistant (PDA (Personal Digital Assistants)) or a tablet PC as long as it functions as the USB host 30A. Further, the host device 30 may be a printer having a USB host function. The host device 30 includes a USB host 30A and a CPU 30B shown in FIG. At least a part of the software portion of the USB host 30A is constructed, for example, by the CPU 30B executing a USB program. In this embodiment, for example, USB 2.0 is used as the USB standard.

  As shown in FIG. 1, the printer 11 includes a control circuit 13 connected by a USB connector 12, a power supply path 12A, and a data line 12B. The printer 11 includes a secondary battery 14 as an example of a rechargeable battery whose charge is controlled by the control circuit 13, a drive circuit 15 that receives an instruction from the control circuit 13, and a drive circuit 15 according to an instruction from the control circuit 13. And a printing mechanism 16 controlled via the printer.

  As shown in FIG. 1, a connector 40A (terminal) of a charging USB battery charger 40 (power adapter) is detachably connected to the USB connector 12. In addition to the USB connector 12, the printer 11 includes an external power connector 17 for supplying power supplementarily. The external power connector 17 is connected to the control circuit 13 through a power supply path 17A and a data line 17B. A connector 50A (terminal) of an AC adapter 50 (power adapter) is detachably connected to the external power connector 17. The connector 50A of the AC adapter 50 has a cylindrical shape similar to the shape of other general AC adapter connectors. In the present embodiment, the host device 30 and the USB battery charger 40 constitute an example of an external device. In particular, the host device 30 constitutes an example of an external device that performs initial processing described later. The USB battery charger 40 constitutes an example of a first device, and the host device 30 constitutes an example of a second device.

  As shown in FIG. 1, an operation panel 19 is provided on the main body 11 a of the printer 11. The operation panel 19 includes an operation switch group 20 that is operated to input various instructions and the like to the printer 11 and a display unit 21 that displays various menus, messages of operation statuses, and the like. The operation switch group 20 is electrically connected to the control circuit 13. The display unit 21 is electrically connected to the control circuit 13 via the display drive circuit 18.

  The operation switch group 20 includes a power switch 20A and an operation switch 20B operated for inputting data by various instruction inputs, selection operations, and the like. By operating the power switch 20A, the printer 11 is turned on and off. That is, the printer 11 switches to the power-on state when the power switch 20A is operated under the power-off state, and switches to the power-off state when the power switch 20A is operated under the power-on state. Further, for example, when the user selects various items by operating the operation switch 20B in the menu displayed on the display unit 21, the control circuit 13 accepts the selection result and sets the printing conditions and the like.

  The control circuit 13 enters the charging mode when the partner to which the USB connector 12 is connected is the host device 30 or the USB battery charger 40 while the printer 11 is turned off. It controls charge control for charging the secondary battery 14 with power supplied through the connector 12. However, if the AC adapter 50 is connected to the external power connector 17 while the printer 11 is powered off, the control circuit 13 gives priority to charging the secondary battery 14 with the power supplied from the AC adapter 50, and the host device 30 or charging based on the power supplied from the USB battery charger 40 is not performed.

  The control circuit 13 also controls print control for printing a document or image based on print job data received from the host device 30 on a print medium such as paper while the printer 11 is powered on. When the AC adapter 50 is connected to the external power connector 17 while the printer 11 is powered on, the printer 11 is operated by the power supplied from the AC adapter 50. Further, the control circuit 13 supplies power from the host device 30 when the partner to which the USB connector 12 is connected is the host device 30 in the power-on state of the printer 11 in which the AC adapter 50 is not connected to the external power connector 17. The printer 11 is operated by the generated power. Further, in this power-on state, if the other party to which the USB connector 12 is connected is the USB battery charger 40, the printer 11 operates with the power supplied from the USB battery charger 40. In the present embodiment, in this power-on state, surplus power that is not used for the operation of the printer 11 out of the power supplied from the host device 30 or the USB battery charger 40 is used for charging the secondary battery 14. Of course, the printer 11 may be in a non-charging mode with the power on, and power supplied from an external device may be used for the operation of the printer 11 and not used for charging the secondary battery 14.

  The printing mechanism 16 of the present embodiment includes a print head (not shown) that prints ink on a print medium such as paper, and a transport device (not shown) that transports the print medium. The print head may be a serial type that performs printing while reciprocating the print head in a scanning direction that intersects the conveyance direction of the print medium, or a long print that can print the print width in the width direction that intersects the conveyance direction at a time. A line head system that prints on a print medium conveyed at a constant speed by a print head or a head group may be used. Further, the print head method may be any of an ink jet method, a dot impact method, and an electrophotographic method. In addition, in the case of an ink jet system, a piezoelectric element or an electrostatic element that generates pressure by bending a plate portion that forms a chamber communicating with a nozzle, or heat is used as a driving element that generates pressure for ejecting ink. Thus, a bubble element that instantaneously generates bubbles can be used. The printer 11 may receive print job data used for printing from the host device 30 by wired or wireless communication, and may read data used for printing from a storage medium such as a memory card.

  As shown in FIG. 1, the control circuit 13 includes a control IC 22, a power supply circuit 23, a CPU 24, and a nonvolatile memory 25. The control IC 22 is an integrated circuit that performs charge control. Here, in addition to the CPU 24 in the control circuit 13, an ASIC (Application Specific IC) may be provided, and the ASIC may control a part (for example, the print head) of the printing mechanism 16. The nonvolatile memory 25 stores various programs necessary for controlling the printer 11 and various setting data that need to be saved even when the printer 11 is turned off. The printer 11 also includes a RAM (not shown) that temporarily stores programs executed by the CPU 24 and various necessary data.

  The power supply path 12 </ b> A and the data line 12 </ b> B of the USB connector 12 are connected to the control IC 22 in the control circuit 13. The power supply path 17A and the data line 17B of the external power connector 17 are connected to the control IC 22. The control IC 22 has a connection detection function for detecting connection of an external device to each of the connectors 12 and 17 and a discrimination function for discriminating the detected connection partner (external device). Further, the control IC 22 performs charge control for charging the secondary battery 14 in the charge mode, manages the power supply paths 12A and 17A for supplying power to the CPU 24 and the drive circuit 15, and transmits data to the CPU 24 and the like. The data lines 12B and 17B are managed.

  The control IC 22 detects the USB connection when either the connector 35A of the USB cable 35 from the host device 30 or the connector 40A of the USB battery charger 40 is connected to the USB connector 12. When the control IC 22 detects the USB connection, for example, when the data line 12B (D +, D−) is (D +) ≠ (D−) (different potential), the host device 30 in which the USB connector 12 is a computer. Is determined to be connected. On the other hand, when (D +) = (D−) (the same potential), the control IC 22 determines that the USB connector 12 is connected to the USB battery charger 40. That is, the control IC 22 can determine whether the connection partner (connection destination) connected to the USB connector 12 is the host device 30 or the USB battery charger 40. In this regard, in the present embodiment, the control IC 22 constitutes an example of a determination circuit that determines a connection partner. The control IC 22 may determine the connection partner using another determination method.

  A power supply circuit 23 is interposed in series between the control IC 22 and the CPU 24 in the power supply path 12A. The power supply circuit 23 transforms the input DC voltage as necessary to drive the drive voltage necessary for the control IC 22 and the CPU 24 (for example, a predetermined voltage within a range of 3 to 6 V), and is necessary for driving the print head in the printing mechanism 16. Generating a driving voltage necessary for driving a transport motor serving as a power source for a transport device that transports a print medium. The secondary battery 14 is connected to a portion of the power supply path 12 </ b> A that connects the control IC 22 and the power circuit 23 via the first switch 26. The first switch 26 is on / off controlled by the control IC 22. When the first switch 26 is on and conducting, the secondary battery 14 is charged by the power supplied from the power supply path 12A.

  Further, a push-type second switch 27 and a third switch 28 composed of a semiconductor switch are interposed in parallel with each other between the power supply circuit 12A and the CPU 24 in the power supply path 12A. Yes. The push-type second switch 27 is mechanically pressed in conjunction with the operation of the power switch 20A, is turned on only during the operation of the power switch 20A, and is turned off when the operation of the power switch 20A is stopped. A fourth switch 29 is interposed on the power supply path 12 </ b> C connecting the power supply circuit 23 and the drive circuit 15.

  The control IC 22 switches the third switch 28 on (conductive) and off (non-conductive) based on the determination result, and switches on (conductive) and off (non-conductive) a switch (not shown) on the data line 12B. The first switch 26 is controlled to be switched on (conducting) and off (non-conducting).

  The trigger for starting the printer 11 is the push-type second switch 27. When the user presses the power switch 20A and the second switch 27 is turned on under the power-off state of the printer 11, the control is performed. The IC 22 maintains the third switch 28 in the on state. Specifically, when an ON signal when the push-type second switch 27 is turned on is input to the CPU 24, the CPU 24 instructs the control IC 22 to turn on / off the printer 11. When the control IC 22 receives a power supply switching instruction from the CPU 24 under the power-off state of the printer 11, the control IC 22 turns on the third switch 28 and the fourth switch 29, while the power is supplied from the CPU 24 under the power-on state of the printer 11. When the switching instruction is received, the third switch 28 and the fourth switch 29 are turned off.

  When the third switch 28 is turned on, necessary power is supplied from the power supply circuit 23 to the CPU 24, and when the third switch 28 is turned off, supply of power from the power supply circuit 23 to the CPU 24 is interrupted. Further, when the fourth switch 29 is turned on, necessary power is supplied from the power supply circuit 23 to the drive circuit 15, and when the fourth switch 29 is turned off, power supply from the power supply circuit 23 to the drive circuit 15 is cut off. Is done. The fourth switch 29 may be configured by a switch group including a plurality of switches provided for each voltage to be supplied to the drive circuit 15.

  In the power-off state of the printer 11, both the third switch 28 and the fourth switch 29 are in the off state. Further, in this power-off state, if the AC adapter 50 is not connected to the external power connector 17 and neither the host device 30 nor the USB battery charger 40 is connected to the USB connector 12, the first switch 26 is in the off state. It is in.

  When the control IC 22 detects the USB connection to the USB connector 12 in a state where the printer 11 is powered off and the AC adapter 50 is not connected, the connection destination is the host device 30 (USB host 30A). If the secondary battery 14 needs to be charged at that time, the third switch 28 that has been in the off state is turned on. When the third switch 28 is turned on, the control IC 22 activates the CPU 24 in order to execute an initial process called enumeration with the host device 30 prior to charging of the secondary battery 14. At this time, the control IC 22 turns on an internal switch so that the CPU 24 can transmit and receive data through the data line 12B.

  When the USB connector 12 is connected to the host device 30, first power (for example, a guaranteed current value of 100 mA) is supplied from the host device 30. In addition, the CPU 24 consumes power equal to or higher than the first power received by the USB connector 12 by performing the initial processing. For this reason, when the CPU 24 is left in a standby state in the middle of the initial process without receiving an initial process completion notification from the host device 30, the secondary battery 14 is caused by the power consumption during the startup of the CPU 24 during the standby time. The remaining amount of will be reduced. Here, the guaranteed power is the power that the USB host must supply to the USB device connected by USB according to the USB standard. In the USB standard, the current value is set to, for example, 100 mA.

  In the present embodiment, when the printer 11 is connected to the host device 30 via the USB while the power is off, the CPU 24 is activated to perform initial processing necessary for charging the secondary battery 14. Call it. Further, “charging activation on” means that the control IC 22 turns on the third switch 28 to activate the CPU 24, and “charging activation off” means that the CPU 24 during the activation of charging is turned off by turning off the third switch 28. Sometimes called.

  Further, when the printer 11 is connected to a power adapter such as the AC adapter 50 or the USB battery charger 40 under the power-on state, the control IC 22 turns on the power by turning on the switches 26, 28, and 29. The CPU 24 and the drive circuit 15 are operated with power supplied from the adapter. At this time, if there is surplus power that is not used for the operation of the printer 11 among the power supplied from the power adapter, the secondary battery 14 is charged with this power. On the other hand, when the printer 11 is connected to the AC adapter 50 or the USB battery charger 40 with the power off, the control IC 22 turns on the first switch 26 and turns off the switches 28 and 29. The secondary battery 14 is charged with the electric power supplied from the power adapter.

  When the control IC 22 charges the secondary battery 14 with the power from the AC adapter 50 or the USB battery charger 40, it is not necessary to perform an initial process, so the CPU 24 is not activated. The USB battery charger 40 and the AC adapter 50 are not limited to those connected to an AC power outlet, but also include those connected to a DC battery.

  A non-volatile memory 25 connected to the CPU 24 stores a USB communication program for initial processing called enumeration including negotiation of the power supply capability with the host device 30. When connection of the host device 30 to the USB connector 12 is detected, the CPU 24 performs initial processing (enumeration) with the host device 30. In the present embodiment, the CPU 24 executes all of the initial processing, but the CPU 24 may execute a part of the initial processing and the ASIC or the control IC 22 may execute the other part. In the present embodiment, the CPU 24 configures an example of a processing circuit that executes at least a part of the initial processing.

  As shown in FIG. 1, the CPU 24 includes a timer 24A. The timer 24A is constituted by a counter in the CPU 24, for example, and functions as a timer by counting clock signal pulses. The CPU 24 causes the timer 24 </ b> A to count the elapsed time from the starting time as the time count T. The non-volatile memory 25 stores a set timeout time T1 (hereinafter, also simply referred to as “timeout time T1”) used when determining whether or not the initial process has failed. When the time T of the timer 24A reaches the timeout time T1 without receiving the initial processing completion notification from the host device 30, the CPU 24 instructs the control IC 22 to turn off the power when the time-out time T reaches the time-out time T1. Stop before charging starts. On the other hand, when the CPU 24 receives the initial processing completion notification from the host device 30 before the time T of the timer 24A reaches the timeout time T1, the CPU 24 instructs the control IC 22 to start charging and turns on the first switch 26. Then, the charging process for charging the secondary battery 14 with the power source from the host device 30 is started. Note that the timer 24 </ b> A may be configured by software that performs timing processing by a program, or may be provided in the control IC 22 or ASIC instead of the CPU 24.

  Here, the timeout time T1 is equal to or longer than the BIOS startup time of the host device 30 having the longest BIOS (Basic Input / Output System) startup time among a plurality of types of host devices 30 expected to be used, and this host device. It is set to a value equal to or less than the time required for adding 30 margins to the BIOS startup time. Here, the margin time can be set as appropriate, but as an example, the margin time is preferably 10% or less of the BIOS startup time. As an example, the timeout time T1 is set to a predetermined value within a range of 30 to 120 seconds. Of course, the time-out time T1 is not limited to the above range, but is associated with the BIOS startup time or is independent of the BIOS startup time, for example, a shorter time such as 10 seconds or 20 seconds, or 3 minutes or 5 minutes. It can also be a longer time.

  Next, with reference to FIG. 2 and FIG. 3, enumeration executed as an initial process for establishing a communication connection state between the printer 11 and the host device 30 and a timeout process by the timer 24A will be described. 2 and 3, an example of the initial process when the USB connection is made under the power-off state will be described, but the initial process when the USB connection is made under the power-on state is basically the same. It is. However, it is preferable to set the timeout time T1 shorter in the initial process when the power is turned on than in the initial process when the power is turned off.

  As shown in FIG. 2, when the printer 11 is USB-connected to the host device 30, enumeration is executed as an initial process between the host device 30 that has detected this USB connection and the printer 11.

  As shown in FIG. 2, in the enumeration, first, the printer 11 receives “USB BusReset” instructing reset processing (bus reset) from the host device 30 at the start of enumeration. Next, a “GetDescriptor” requesting configuration information called a descriptor is received. In response to this request, the printer 11 returns configuration information to the host device 30. The configuration information includes class information of the USB device 11A, power mode information indicating bus power or self power, and required power value information indicating the value of power required for the host device 30. Here, when the printer 11 is powered off, the class information is, for example, “human interface device (HID) class”. When the printer 11 is powered on, the class information is “printer class”, for example.

  In the present embodiment, the initial process for requesting bus power corresponds to an example of the first initial process. Further, the initial process for requesting self-power corresponds to an example of the second initial process. In the following description, an initial process for requesting bus power may be referred to as a first initial process, and an initial process for requesting self power may be referred to as a second initial process.

  In the first initial processing for requesting bus power, second power larger than the first power (guaranteed power (eg, current value 100 mA)) is set as the required power value information. The required power value information is indicated by required current value information that requests a current value under a predetermined power supply voltage (for example, 5 volts). The requested current value information for requesting the second power is, for example, “500 mA” corresponding to the maximum power that can be supplied by the USB standard. The second power is not limited to the maximum power, but may be any power that can charge the secondary battery 14, and may be a power that is larger than the first power and less than the maximum power. Furthermore, the second power may be greater than the power “0 (zero)” supplied from the host device 30 after the completion of the second initial process requesting self-power and less than the maximum power.

  Then, the host device 30 recognizes that the USB device connected by USB based on the class information (for example, “HID class”) is a human interface device. Further, the host device 30 determines whether or not power supply with the requested second power is possible based on the requested current value information (for example, 500 mA), and power supply with the second power is possible. If so, the configuration information is set, and “SetConfiguration” which is an initial processing completion notification (setting completion notification) is transmitted to the printer 11.

  As shown in FIG. 2, charging is not possible until the power supply with the second power requested from the printer 11 in the enumeration is permitted and the initial processing completion notification “SetConfiguration” is received. When the initial processing completion notification is received, the power is supplied from the host device 30 to the printer 11 with the requested second power, and the secondary battery 14 can be charged.

  In this embodiment, when the USB device is detected when the printer 11 is powered off and the AC adapter 50 is not connected, the CPU 24 in the printer 11 is activated when the connection partner is the host device 30. (Charge start-up is on). At substantially the same time as the start of charging of the CPU 24, the CPU 24 starts measuring time by the timer 24A. The CPU 24 measures the elapsed time from the activation time by the timer 24A, and determines whether or not the time T has reached the timeout time T1. If the initial processing completion notification “SetConfiguration” is received before the time T reaches the timeout time T1, power supply at the second power (for example, 500 mA in current value) is started from the host device 30. The secondary battery 14 is charged with the second electric power.

  On the other hand, as shown in FIG. 3, the configuration information transmitted by the printer 11 in the initial process started when the USB connection between the printer 11 and the host device 30 is detected and the CPU 24 in the printer 11 is activated (charging activation is turned on). Is not permitted by the host device 30, the printer 11 cannot receive the initial processing completion notification “SetConfiguration”. In this case, in the printer 11, the time T of the timer 24A reaches the timeout time T1 without receiving the initial process completion notification. As described above, when the time T reaches the timeout time T1 without receiving the initial process completion notification “SetConfiguration”, the printer 11 turns off the power of the CPU 24 that is internally turned on for the purpose of charging. , Turn off charging start (power off).

  Here, as an example in which the initial processing completion notification cannot be received even after the time-out period T1 has elapsed, the following cases may be mentioned. For example, as shown in FIG. 4, in a configuration in which the host device 30 and the printer 11 are connected via a hub 60 (branch device) operating with bus power, the port 60a of the hub 60 is, for example, an N port ( In the example of FIG. 4, the power can be supplied only at a current value of 500 / N (mA) per port (100 mA in the example of FIG. 4). Therefore, even if the printer 11 transmits configuration information including class information and requested current value information (for example, 500 mA), the host device 30 recognizes that it is via a hub and uses the second power (for example, a current value of 500 mA). It is determined that the power cannot be supplied. For this reason, since the host device 30 cannot permit the power supply with the requested second power, the configuration information is not set. As a result, as illustrated in FIG. 3, the host device 30 does not transmit the initial processing completion notification “SetConfiguration” to the printer 11. For this reason, the printer 11 enters a standby state waiting for reception of the initial processing completion notification “SetConfiguration” that is not transmitted from the host device 30.

  In some cases, the host device 30 is set to limit power supply to the USB device (printer 11) to a predetermined power less than the maximum power (for example, a current value of 500 mA) when the battery is driven. In such a host device 30, the power supply with the second power requested from the printer 11 cannot be performed, and thus the initial processing completion notification “SetConfiguration” is not transmitted from the host device 30 to the printer 11. Also in this case, the printer 11 is in a standby state waiting for reception of an initial processing completion notification “SetConfiguration” that is not transmitted from the host device 30.

  In this standby state, the CPU 24 waits in an activated state (charging activation on state), and thus consumes the power of the secondary battery 14. In this standby state, the printer 11 receives power supply from the host device 30 through the USB cable 35 with the first power (current value is, for example, 100 mA), but the power consumed by the activated CPU 24 in the initial processing exceeds the first power. Therefore, the remaining amount of the secondary battery 14 gradually decreases as the standby time elapses.

  Therefore, in the present embodiment, the above-described timeout time T1 is set, and when the timing time T reaches the timeout time T1 and times out without receiving the initial processing completion notification, it is included in the configuration information responding to the host device 30. Assuming that the request is not permitted and the initial process has failed, the CPU 24 turns off the power (charge activation off). The timeout time T1 is set to a value corresponding to the longest BIOS startup time among a plurality of types of host devices 30 that are assumed to be connected to the USB connector 12, and the host device 30 waits for BIOS startup. It will time out after waiting for almost enough time. For this reason, the timeout time T1 is set to easily avoid the inconvenience that the secondary battery 14 cannot be charged due to a timeout due to a timeout time that is too short even if the battery can be charged.

  The timeout time T1 may be the same when the power is turned on and when the power is turned off, but in this embodiment, the timeout time T1 is set to a different value between when the power is turned on and when the power is turned off. In particular, in the present embodiment, the timeout time T12 when the power is turned on is set shorter than the timeout time T11 when the power is turned off (T11> T12). This setting is made for the following reason. Since the user does not instruct the printer 11 from the host device 30 when the power is turned off (for example, print processing), the timeout time T11 when the power is turned off is a slightly longer value corresponding to the required startup time of the host device 30. There is no problem even if it is set. However, if the time-out time T12 when the power is turned on becomes long, it may cause a delay in the start of processing instructed by the user from the host device 30 to the printer 11. For this reason, a relatively long timeout time T11 is set to increase the frequency of charging while the power is off, and the waiting time of processing instructed from the host device 30 to the printer 11 by the user is suppressed while the power is on. Therefore, a relatively short timeout time T12 is set. Note that the timeout time may be set so as to satisfy T11 <T12.

  When the operation switch 20B is operated and the display unit 21 moves to a lower level of the menu, a mode setting screen G1 as shown in FIG. 5 is displayed. The mode setting screen G1 includes a first button 71 that is selected when setting the bus power mode by operating the operation switch 20B, and a second button 72 that is selected when setting the self-power mode. It has been. The bus power mode is set when the user operates the operation switch 20B and selects the first button 71, and the self power mode is set when the second button 72 is selected. The user-set power mode is written by the CPU 24 into a predetermined storage area (see FIG. 6A) of the nonvolatile memory 25.

  As shown in FIG. 6, when the “bus power mode” is selected and set by operating the operation switch 20B, a value (1 as an example) indicating the bus power is stored in the first storage area 25A of the nonvolatile memory 25. Is done. On the other hand, when the “self power mode” is selected and set by operating the operation switch 20B, the fact that self power is applied (“0” as an example) is stored in the first storage area 25A of the nonvolatile memory 25. In this way, the user can select bus power or self power. The USB communication mode setting content (user setting content) set by the user by operating the operation switch 20B is stored in the first storage area 25A of the nonvolatile memory 25.

  Here, the bus power refers to a power supply mode in which power is supplied from the host device 30 through the bus line of the USB cable 35 when connected to the host device 30 through the USB cable 35. On the other hand, the self-power refers to a non-power receiving mode in which an electronic device (in this example, the printer 11) does not receive power from the host device 30 when it is connected to the host device 30 through the USB cable 35. .

  In addition to the user setting contents, the nonvolatile memory 25 is provided with a second storage area for storing success or failure of the initial process (first initial process) including a request for bus power. In this embodiment, the initial setting is bus power, the bus power setting is maintained if the initial process executed for establishing USB communication with the host device is successful, and the self power setting is set if the initial process fails. Can be switched. Therefore, as shown in FIG. 6, information related to the success or failure (success / failure) of the initial process requesting the previous bus power is stored in the second storage area 25 </ b> B of the nonvolatile memory 25. That is, when the initial process for requesting bus power is successful, a value indicating success (for example, “1”) is written in the second storage area 25B as shown in FIG. In the case of failure, as shown in FIG. 6B, a value (for example, “0”) indicating failure is stored in the second storage area 25B.

  Based on the value stored in the second storage area 25B, the CPU 24 requests the bus power again and performs the first initial process if the previous initial process (first initial process) that requested the bus power is successful. On the other hand, if it fails, an initial process (second initial process) for requesting self-power is executed this time. When it is detected that the USB cable 35 is disconnected from the USB connector 12, the setting content of the second storage area 25B is rewritten to the initial setting value indicating the bus power. This is because the host device 30 of the other party is the same while the connection of the USB cable 35 is maintained, so the host device 30 that has once succeeded may be subjected to the initial process of requesting bus power this time. This is because the host device should succeed with high probability, and the host device that has once failed should also fail with high probability even if the initial processing requesting bus power is performed again. For this reason, while the USB connection with the host device 30 is maintained, the CPU 24 checks the previous success / failure information in the nonvolatile memory 25 at the timing of performing the next initial processing, and this time The required power mode at the time of initial processing is set to bus power if the previous time is successful, and to self power if the previous time is unsuccessful. The values stored in the second storage area 25B of the nonvolatile memory 25 are “1” and “0”. Here, “1” and “0” are described as values indicating success / failure for convenience of explanation, but they are also synonymous as values indicating bus power / self power.

  Further, the non-volatile memory 25 of the printer 11 stores a charging processing program when the power is turned off as shown in the flowcharts of FIGS. 7 to 9 and a USB communication processing program when the power is turned on as shown in FIG. Yes. This program includes a part written in the control IC 22 (steps S1 to S5) and a part stored in the nonvolatile memory 25 and executed by the CPU 24 (step S6).

  Next, the operation of the printer 11 will be described with reference to FIGS. That is, the charging process when the power is turned off (FIGS. 7 to 9) executed by the control IC 22 and the CPU 24 in the printer 11 and the USB communication process when the power is turned on (FIGS. 9 and 10) executed by the CPU 24 in the printer 11. And will be described. The charging process shown in FIGS. 7 to 9 is performed when the printer 11 is in a power-off state and the AC adapter 50 is not connected and the secondary battery 14 is not charged by the AC adapter 50. Done.

  As shown in FIG. 6A, “bus power” (for example, value “1”) is set in the first storage area 25A in the nonvolatile memory 25 (hereinafter also simply referred to as “memory 25”). It is assumed that “success (bus power)” (for example, value “1”) is set in the second storage area 25B. That is, the setting values of the first storage area 25A and the second storage area 25B are the values at the time of initial setting. As described above, it is assumed that the bus power is set as the user setting, and the success value is set as the initial process success / failure information.

When any connector is connected to the USB connector 12 and USB connection is detected, the control IC 22 is activated and the charging process shown in FIG. 7 is started.
First, in step S1, it is determined whether or not the connection destination is a host device. That is, the control IC 22 determines whether the connection destination is the host device 30 functioning as the USB host 30A or a power adapter such as the USB battery charger 40. For example, when the data line is (D +) ≠ (D−), it is determined that the connection destination is the host device 30, and when (D +) = (D−), it is determined that the connection destination is the power adapter. . If the connection destination is not the host device 30 but the power adapter, the process proceeds to step S13. If the connection destination is the host apparatus 30, the process proceeds to step S14.

In step S2, charging is started with the power adapter. In this example, the secondary battery 14 is charged with power from the USB battery charger 40.
In step S3, it is determined whether or not the remaining amount of the secondary battery is less than a threshold value. That is, it is determined whether or not the remaining amount of the secondary battery 14 is less than a threshold value that is sufficient for performing the initial process. If the remaining capacity of the secondary battery 14 is less than the threshold value, the process proceeds to step S4, and if not, the process proceeds to step S5.

  In step S4, the secondary battery is charged with the first power (for example, 100 mA). The charging with the first power is performed until the remaining amount of the secondary battery 14 reaches a threshold value. And if the secondary battery 14 is charged until the remaining amount becomes more than a threshold value (it is negative determination by S3), it will progress to step S5.

  In step S5, the CPU is activated (charging activation is on). That is, the control IC 22 activates the CPU 24 by switching the third switch 28 from off to on. In this way, the CPU 24 is activated in order to perform necessary initial processing with the host device 30 before starting the charging of the secondary battery 14.

  In step S6, a charging process by the CPU is performed. This charging process is performed by the CPU 24 executing a charging process routine when the power is turned off as shown in FIG. Hereinafter, the charging process routine by the CPU 24 will be described with reference to FIG.

  First, in step S11, user settings relating to the power mode are determined. That is, it is determined whether the user setting is bus power or self power. In this example, the user setting is bus power in the initial setting, and the self power is set when the user selects the self power by operating the operation switch 20B. The CPU 24 determines whether the power mode is bus power or self power based on the value stored in the first storage area 25A of the memory 25.

  Here, one of the purposes for the user to set self-power is that even when the host device 30 is connected to the printer 11 via the hub 60 and cannot supply power at the second power (for example, 500 mA in current value), Since the initial process is performed with self-power, the initial process is unlikely to fail. For example, in the case of the initial processing when the power is turned on, USB communication is thereafter established reliably, and the printer 11 can perform printing based on the print data from the host device 30. However, in the present embodiment, even if the initial process for requesting the bus power fails due to a reason such as via the hub 60, the control for detecting the failure and switching from the bus power to the self power is adopted. The purpose of setting the self power by the user is that the power of the battery of the notebook computer or the like is not used by the printer 11 when the host device 30 is operating with the power of the battery of the notebook computer or the like, so that it lasts for a long time. It is to do. If the user setting is bus power, the process proceeds to step S12. If the user setting is self power, the process proceeds to step S17. Since charging is not performed in the case of self-power, charging activation is turned off by turning off activation of the control IC 22 and the CPU 24 in step S17 (charging activation off).

  In step S12, it is determined whether or not the value of the memory 25 (second storage area 25B) is successful. If it is a value indicating “success” (for example, “1”), the process proceeds to step S13. If it is not a value indicating success (that is, if it is a value indicating failure (for example, “0”)), the process proceeds to step S17. move on. Since charging is not performed in the case of self-power, charging activation is turned off by turning off activation of the control IC 22 and the CPU 24 in step S17 (charging activation off).

  In step S13, pull-up is performed. That is, the CPU 24 performs pull-up by changing the voltages of the data lines D + and D−. By this pull-up, the host device 30 detects the connection of the USB device 11A (printer 11) and starts an initial process (enumeration) (see FIGS. 2 and 3).

  In step S14, an initial process (first initial process) for requesting bus power is executed, and it is determined whether or not the initial process is successful. The processing in step S14 is performed by the CPU 24 executing an initial processing routine shown in the flowchart of FIG. 9, and the details thereof are performed as follows.

  First, in step S31 of FIG. 9, timer timing is started. That is, the CPU 24 causes the timer 24A to start measuring time. As a result, the timer 24A measures the elapsed time (timed time T) from the starting point of the CPU 24 (more precisely, the pull-up point). Note that the order of the timing start process (S31) and the pull-up process (S13) by the timer 24A may be reversed.

  In step S32, an initial process (first initial process) for requesting bus power is performed. In response to a request from the host device 30, configuration information called a descriptor is transmitted. The configuration information includes class information indicating the class of the USB device, power mode information requested from the USB host (requested power mode information), and power information requested from the USB host (requested power information). One of the printer class and the human interface device (HID) class is used for the class information. Since printing is not performed while the power is off, the HID class is used. In the charging mode in the power-off state, the printer 11 of this example requests “bus power” and requests second power (for example, 500 mA in current value) as supplied power at that time. For this reason, the printer 11 responds to the host device 30 with configuration information that specifies the HID class and requests the second power with the bus power. In the initial process performed while the power is turned on, the printer class is used as the class information in the configuration information, and the host device 30 recognizes the USB device 11A as a printer. In addition, other classes such as a mass storage class may be used instead of the HID class.

  The initial processing for requesting the bus power is performed as shown in FIG. When USB connection is detected by pull-up, enumeration is started between the host device 30 and the printer 11 as an initial process. First, “USB BusReset” instructing the bus reset is transmitted from the host device 30 to the printer 11, and the printer 11 that has received this instruction resets the bus. Next, “GetDescriptor” requesting configuration information (descriptor) is transmitted from the host device 30 to the printer 11. The printer 11 that has received “GetDescriptor” transmits configuration information including class information (eg, “HID”), power mode information (“bus power”), and required power information (“second power (eg, 500 mA)”). .

  Based on the configuration information received from the printer 11, the host device 30 determines whether the USB communication connection can be permitted under the requested conditions. If the host device 30 determines that the power can be supplied with bus power and the second power, the configuration information of the printer 11 is written in the memory to set the device configuration and the printer 11 as shown in FIG. An initial process completion notification “SetConfiguration” is sent to the effect that the initial process is complete.

  On the other hand, as shown in FIG. 4, when the host device 30 and the printer 11 are connected via a bus power hub, even if the printer 11 transmits configuration information including bus power and second power, the host device 30 recognizes that it is via the hub and determines that power supply with the requested second power is impossible, and does not permit establishment of USB communication. In this case, as shown in FIG. 3, the initial processing completion notification “SetConfiguration” is not transmitted from the host device 30 to the printer 11. Therefore, the CPU 24 in the printer 11 waits for the initial processing completion notification “SetConfiguration” that is not transmitted from the host device 30 in the activated state. During this standby, the CPU 24 that is being activated (charging activation is on) wastes power, and the remaining amount of the secondary battery 14 is reduced.

  In addition, when the host device 30 is driven by a battery, the second power requested from the printer 11 is set when the power supplied to the USB device 11A is set to be less than or equal to a predetermined power less than the maximum power (current value is 500 mA). The power cannot be supplied at (current value of 500 mA). For this reason, the initial processing completion notification “SetConfiguration” is not transmitted from the host device 30 to the printer 11. Also in this case, the CPU 24 in the printer 11 waits for the initial processing completion notification “SetConfiguration” that is not transmitted from the host device 30 in the activated state. During this standby, the power of the secondary battery 14 is wasted by the activated CPU 24. In these cases, when the first power (100 mA in current value) is supplied from the host device 30 through the USB cable 35, but the power consumed by the starting CPU 24 in the initial process exceeds the first power, the secondary battery 14 The remaining amount of will gradually decrease.

  In step S33, it is determined whether an initial processing completion notification has been received. If the CPU 24 does not receive the initial process completion notification, the process proceeds to step S34. If the initial process completion notification is received and the initial process is successful, the CPU 24 proceeds to step S15 (FIG. 8).

  In step S34, it is determined whether or not a timeout has occurred. That is, it is determined whether or not the time T of the timer 24A has reached the timeout time T1. If not timed out, the process returns to step S33. The processes in steps S33 and S34 are repeatedly executed until the initial process completion notification is received in this way (Yes in S33) or until time-out occurs (Yes in S34). If time-out occurs and the initial process fails, the process proceeds to step S16 (FIG. 8).

  Returning to FIG. 8, in the process of step S14 (FIG. 9), if the initial process completion notification is received and the initial process is successful, the process proceeds to step S15. On the other hand, a timeout occurs before the initial process completion notification is received. If the initial process fails, the process proceeds to step S16.

In step S15, the secondary battery is charged with the second power (current value is 500 mA). That is, the secondary battery 14 is charged with the second power supplied from the host device 30.
On the other hand, if the initial process has failed, a value indicating failure is written in the memory in step S16. The CPU 24 writes a value indicating failure (for example, “0”) in the second storage area 25B of the memory 25 as shown in FIG. 6B, for example. If the initial process is successful in step S14, the value indicating success at the time of initial setting (initial value (eg, “1”)) is stored in the second storage area 25B of the memory 25 as initial process success / failure information. Is stored, so rewriting is not performed. Of course, a value indicating success may be written in the memory 25.

  In the next step S17, the charging activation is turned off by turning off the CPU 24 and the control IC 22 (charging activation off). Specifically, when the time T, which is the elapsed time from the CPU activation time, reaches the timeout time T1 without receiving the initial process completion notification, the CPU 24 and the control IC 22 in the activated state are both turned off, The charging of the next battery 14 is stopped before the start. This charging start-off process is performed, for example, by the control IC 22 turning off the third switch 28 in accordance with an off instruction from the CPU 24 to turn off the power of the CPU 24 and then turning off its own power. In this way, it is possible to suppress the waste of power and the decrease in the remaining amount of the secondary battery 14 due to the CPU 24 waiting for the initial process completion notification that is not sent due to the failure of the initial process.

  In this way, when the initial processing is successful in response to the bus power request, the secondary battery is charged, and when the initial processing fails, the failure is stored in the memory 25 and the USB connection detection is triggered. The power supply of the control IC 22 and the CPU 24 that are activated at the time is turned off.

  During this charging or power off, the CPU 24 performs the following processing. That is, during charging, it is determined whether or not a power-on operation has been performed in step S18, whether or not the USB cable has been disconnected in step S19, and whether or not the USB charging end condition is satisfied in step S20. Of these, one determination process is repeated until an affirmative determination is obtained. For example, if there is a power ON operation in step S18, the process proceeds to step S21 to perform power ON processing. That is, the second switch 27 is turned on only during the operation of the power switch 20A, the CPU 24 is activated when power is supplied from the power circuit 23 to the CPU 24, and the CPU 24 instructs the control IC 22 to switch the third switch. 28 is connected. For this reason, even if the hand is released after pressing the power switch 20A, the power supply to the CPU 24 is maintained. Note that the power-on process in the present embodiment includes a process of temporarily turning off the charging activation that activates only a part of the printer 11 and then switching the entire printer 11 to the power-on. In this case, when only a part is activated, it is necessary to monitor which part is being activated and to perform the process of activating only the other part. This requires troublesome control to select and start a part, so that it is possible to reduce the monitoring burden and the control burden by turning off part of the power supply once turned on and then turning the printer 11 on again. is there.

  In the next step S22, USB reconnection processing is performed. That is, the pull-up state is once released. Then, the processing is shifted to the USB communication processing routine (FIG. 10) when the power is turned on. As a result, when the USB cable 35 is connected and pulled up in step S43 or S44 described later in the USB communication processing routine when the power is turned on, the USB host 30A of the host device 30 reconnects to the USB device 11A (USB Connection). For this reason, the host device 30 can perform initial processing (S45 or S49) with the printer 11 by reconnection.

  In step S19, if the USB cable is disconnected (affirmative determination), the routine ends. At this time, the charging of the secondary battery 14 is stopped by disconnecting the USB cable 35.

  Furthermore, when the USB charge termination condition is satisfied in step S20, the process proceeds to step S23, and the power activation of the CPU 24 and the control IC 22 is turned off to turn off the charging activation. Here, the USB charging termination condition refers to a condition for terminating the charging of the secondary battery 14 while maintaining the USB connection with the host device 30 through the USB cable 35. (1) The secondary battery 14 is fully charged. (2) The condition is that a power adapter such as the AC adapter 50 that is prioritized as a power source for charging over the host device 30 is connected. Here, the control IC 22 monitors the remaining amount of the secondary battery 14 during charging, and when the secondary battery 14 is fully charged, the secondary battery 14 is charged by turning off the first switch 26. Terminate. The control IC 22 notifies the CPU 24 that the secondary battery 14 is fully charged. When either one of these two conditions is satisfied, USB charging to the secondary battery 14 is stopped and charging activation is turned off. For example, when the AC adapter 50 is connected, the control IC 22 that detects the connection stops the activation of the CPU 24. Then, the power source is switched from the host device 30 via USB to the AC adapter 50, and thereafter, the secondary battery 14 is charged with power supplied via the AC adapter 50. Then, after the charge activation is turned off, the process proceeds to step S26 which is one of the processes during the charge activation off.

  On the other hand, after the charging activation is turned off (S17), it is determined whether or not the power is turned on in step S24, whether or not the USB cable is disconnected in step S25, and the USB charging start condition is satisfied in step S26. Is repeatedly executed until an affirmative determination is obtained in one of the determination processes. For example, if there is a power-on operation in step S24, the process proceeds to step S21 to perform the power-on process similar to that during the power-on operation during charging, and after performing the USB reconnection process in step S22, Shift to the USB communication processing routine when ON.

  If the USB cable is unplugged in step S25 (positive determination), the process proceeds to step S27, the memory 25 is rewritten with a value indicating success, and then the routine ends. Here, the reason why the memory 25 is rewritten to a value indicating success is that the host device 30 may be changed when the USB connection is made next because the USB cable 35 is disconnected. This is because the initial processing by the bus power can be tried because there is a high possibility that the initial processing will be successful if is changed.

  Further, when the USB charging start condition is satisfied in step S26, the process proceeds to step S28, and the power activation of the CPU 24 and the control IC 22 is turned off to turn off the charging activation. Here, the USB charging start condition refers to a condition for starting the charging of the secondary battery 14 under the charging start-off state while the USB connection with the host device 30 through the USB cable 35 is maintained. The USB charge start condition includes (3) a threshold value (for example, a predetermined value (%) within a range of 90 to 99% of full charge) where the remaining amount of the secondary battery 14 is set to a value lower than the full charge by a predetermined level. And (4) that the power adapter such as the AC adapter 50, which has priority over the host device 30 as a power source for charging, is disconnected. If one of these two conditions is satisfied, the process proceeds to step S28.

  In step S28, the control IC 22 and the CPU 24 are activated to turn on the charging activation (charging activation on). After this charging activation is turned on, the process returns to S11. That is, by setting the CPU 24 to the activated state before the end of the routine, the CPU 24 can start the routine again based on the establishment of the charging start condition. As described above, after the USB charging end condition is satisfied (Yes in S20), the USB charging start condition is satisfied and the charging is started in a state where the connection with the host device 30 is continued without disconnecting the USB cable 35 (S26). , S28), and pulling up in the next step S13, the printer 11 is reconnected to the host device 30.

  For example, when the above charging processing routine is completed in a state in which a value indicating failure is written in the memory 25 while maintaining the USB connection with the host device 30 through the USB cable 35, the following processing is performed. . That is, since the memory value in step S12 is unsuccessful, the charging activation is turned off without proceeding to the initial process (S14) (S17).

  That is, when the USB cable 35 is not disconnected, the USB connection partner is the same as the host device 30 at the time of the previous initial processing. Therefore, if the previous failure occurs, this time also fails. If the fact that the previous initial processing has failed is stored in the memory, the charge activation is turned off without performing the first initial processing that requests bus power. For this reason, it is possible to suppress the waste of power and the reduction in the remaining amount of the secondary battery 14 due to the execution of useless initial processing.

  On the other hand, when the USB cable 35 is disconnected, there is a possibility that the connection partner when the USB connection is detected next is the host device 30 different from that when the USB cable 35 is disconnected. Even if the initial processing failed in the previous host device 30, the value of the memory 25 (second storage area 25B) is written from “failure” to “success” when the USB cable 35 is disconnected last time. It is replaced (S27). For this reason, after that, since the value indicates success in step S12 after the routine is restarted, the first initial process for requesting bus power may be executed in step S14 that has proceeded through the pull-up (S13). it can. For this reason, if the connection partner is a host device 30 different from the previous one and the bus power and the second power are permitted, the secondary battery 14 is charged with the second power (500 mA in current value) supplied with the bus power. can do.

  Further, when the printer 11 is started by turning on the power while being connected to the host device 30 via the USB cable 35 when the initial processing has failed, the value of the memory 25 (second storage area 25B) is “failed”. The value to the effect remains. Further, when the printer 11 is activated by turning on the power while connected to the host device 30 via the USB cable 35 when the initial processing is successful, the value of the memory 25 (second storage area 25B) is “success”. It becomes the value of the effect.

  Next, a USB communication processing routine when the power is turned on will be described with reference to FIG. When the user operates the power switch 20A to turn on the printer 11 connected to the host apparatus 30 via the USB cable 35, the CPU 24 executes the USB communication processing routine shown in FIG. Further, when the printer 11 is powered on and not connected by USB, the CPU 24 also executes the USB communication processing routine shown in FIG. 10 when the USB is connected. When the user operates the input device (not shown) of the host device 30 to instruct printing when the printer 11 is in the power-on state, print data is transmitted from the host device 30 to the printer 11 through the USB cable 35. However, in order to cause the printer 11 to print in accordance with an instruction from the host device, it is necessary that the initial processing is successful and USB communication is established between the two.

  First, steps S41 to S43 are the same processes as steps S11 to S13 in FIG. That is, in step S41, it is determined whether the user setting is bus power or self power. Specifically, the CPU 24 determines whether the power mode set by the user is bus power or self power based on the value stored in the first storage area 25A of the memory 25. If the user setting is bus power, the process proceeds to step S42. If the user setting is self power, the process proceeds to step S44.

  Here, one of the purposes for the user to set self-power is that even when the host device 30 is connected to the printer 11 via the hub 60 and cannot supply power at the second power (for example, 500 mA in current value), It is to perform initial processing by self-power, establish USB communication when the power is turned on, and enable printing based on print data from the host device 30. However, in the present embodiment, even when the user setting is bus power, the control for detecting the failure of the initial process and switching from the bus power to the self power is adopted.

  In step S42, it is determined whether or not the value of the memory 25 (second storage area 25B) is successful. If the value is “success” (eg, “1”), the process proceeds to step S43. If the value is not success (ie, if the value is failure (eg, “0”)), the process proceeds to step S44. move on.

  In step S43, pull-up is performed. That is, the CPU 24 performs pull-up by changing the voltages of the data lines D + and D−. By this pull-up, the host device 30 detects the connection of the USB device 11A (printer 11) and starts an initial process (enumeration) (see FIGS. 2 and 3).

  In the next step S45, an initial process (first initial process) for requesting bus power is executed, and it is determined whether or not the initial process is successful. The processing in step S45 is performed by the CPU 24 executing an initial processing routine shown in the flowchart of FIG. 9, and details thereof are performed as follows.

  First, in step S31 of FIG. 9, timer timing is started. That is, the CPU 24 causes the timer 24A to start measuring time. As a result, the timer 24A measures the elapsed time (timed time T) from the starting point of the CPU 24 (more precisely, the pull-up point). Note that the order of the timing start process (S31) and the pull-up process (S13) by the timer 24A may be reversed.

  In step S32, an initial process (first initial process) for requesting bus power is performed. Here, the CPU 24 transmits configuration information called a descriptor in response to a request from the host device 30. At this time, since it is assumed that printing is performed while the printer 11 is powered on, the printer class is used. The CPU 24 specifies the printer class, and responds to the host device 30 with configuration information for requesting the second power (for example, 500 mA in current value) with the bus power. The host device 30 recognizes the USB device 11A as a printer because the class information in the configuration information is a printer class. For this reason, when receiving a print request, the host device 30 transmits print data to the printer 11 through USB communication.

  This first initial process is performed as shown in FIG. 2 when the power is turned on, as in the case of the power supply 0FF. When USB connection is detected by pull-up, enumeration is started between the host device 30 and the printer 11 as an initial process. Upon receiving “GetDescriptor” from the host device 30, the printer 11 includes class information (eg, “printer”), power mode information (“bus power”), and required power information (“second power (eg, 500 mA)”). Send configuration information (descriptor).

  Based on the configuration information received from the printer 11, the host device 30 determines whether the USB communication connection can be permitted under the requested conditions. If the host device 30 determines that the power can be supplied with bus power and the second power, the configuration information of the printer 11 is written in the memory to set the device configuration and the printer 11 as shown in FIG. An initial processing completion notification “SetConfiguration” is sent to

  On the other hand, as shown in FIG. 4, when the host device 30 and the printer 11 are connected via a bus power hub, even if the printer 11 transmits configuration information including bus power and second power, the host device 30 recognizes that it is via the hub and determines that power supply with the requested second power is impossible, and does not permit establishment of USB communication. In this case, as shown in FIG. 3, the initial processing completion notification “SetConfiguration” is not transmitted from the host device 30 to the printer 11. Therefore, the printer 11 waits for the initial processing completion notification “SetConfiguration” that is not transmitted from the host device 30 in the activated state. During this standby, power is wasted by the activated CPU 24.

  In addition, when the host device 30 is driven by a battery and the power supplied to the USB device 11A is limited, the second power (500 mA in current value) requested from the printer 11 cannot be permitted. Also in this case, the CPU 24 in the printer 11 waits for the initial processing completion notification “SetConfiguration” that is not transmitted from the host device 30 in the activated state, and wastes power. In these cases, the first power (100 mA in current value) is supplied from the host device 30 through the USB cable 35 during standby until the notification of completion of the initial process is sent, but the activated CPU 24 is in the initial process. When the consumed power exceeds the first power, the remaining amount of the secondary battery 14 gradually decreases.

  In step S33, it is determined whether an initial processing completion notification has been received. If the CPU 24 does not receive the initial process completion notification, the process proceeds to step S34. If the initial process completion notification is received and the initial process is successful, the CPU 24 proceeds to step S46 (FIG. 10).

  In step S34, it is determined whether or not a timeout has occurred. That is, it is determined whether or not the time T of the timer 24A has reached the timeout time T1. If not timed out, the process returns to step S33. The processes in steps S33 and S34 are repeatedly executed until the initial process completion notification is received in this way until the initial process is successful (Yes in S33) or until the time-out occurs and the initial process fails (Yes in S34). If time-out occurs and the initial process fails, the process proceeds to step S47 (FIG. 10).

  Returning to FIG. 10, in the process of step S45 (FIG. 9), if the initial process completion notification is received and the initial process is successful, the process proceeds to step S46, and on the other hand, a timeout occurs before the initial process completion notification is received. If the initial process fails, the process proceeds to step S47.

  In step S46, USB communication processing is performed with bus power. Here, the USB communication processing refers to processing performed by the printer 11 that is powered on via USB communication with the host device 30 and includes various notification processing including printing processing and ink remaining amount notification, for example. At this time, USB communication processing such as printing processing is performed using second power (current value: 500 mA) supplied by bus power. If there is a surplus power that is not used in the USB communication process in the second power, the surplus power may be used for charging the secondary battery 14 while the power is on.

  On the other hand, if the initial process fails, in step S47, a value indicating failure is written in the memory, and the mode is switched to self power. The CPU 24 writes a value indicating failure (for example, “0”) in the second storage area 25B of the memory 25 as shown in FIG. 6B, for example. Thereafter, the CPU 24 refers to the value of the memory 25 to determine success or failure (S42), so that the bus power is switched to the self power by rewriting to the value indicating the failure of the memory 25. If the initial process is successful in step S45, the value indicating the initial setting success (initial value (eg, “1”)) is stored in the second storage area 25B of the memory 25 at that time. There is no particular rewriting. Of course, a value indicating success may be written in the memory 25.

  In the next step S48, USB reconnection processing is performed. That is, the pull-up state is once canceled and then pulled up again. As a result, the USB host 30A of the host device 30 detects the connection (USB connection) with the USB device 11A while the USB cable 35 is connected. As a result, the host device 30 can perform initial processing with the printer 11.

  Thus, when the user setting is self-power (S41), when the value of the memory 25 is a value indicating failure (No determination at S42), when initial processing at the time of bus power request fails (No determination at S45). Are both pulled up (S44 or S48) and then proceed to step S49.

In the next step S49, an initial process for requesting self-power (second initial process) is executed.
Here, the CPU 24 specifies a printer class in response to a request from the host device 30 and responds to the host device 30 with configuration information for requesting self-power. Similar to the initial process at the time of requesting bus power, the initial process at the time of requesting self-power is performed as shown in FIG. When the USB connection is detected by the pull-up and the initial process is started between the host device 30 and the printer 11, the printer 11 responds to the request “GetDescriptor” from the host device 30 with class information “printer class”, It responds with configuration information including power mode information “self power” and required power information (for example, a value in the range of 0 to 10 mA).

  Based on the configuration information received from the printer 11, the host device 30 determines whether or not the USB communication connection can be permitted under the requested conditions, and permits the establishment of USB communication because it is self-powered. The host device 30 writes the configuration information of the printer 11 in the memory to set the device configuration and the like, and transmits an initial processing completion notification “SetConfiguration” to the printer 11 as shown in FIG. As a result, the initial process is successful. Further, since the class information in the configuration information is the printer class, the host device 30 recognizes the USB device 11A as a printer. Therefore, the host device 30 transmits print data to the printer 11 when a print request is received.

  In step S50, USB communication processing is performed with self power. Since it is self-powered, there is no power supply from the host device 30, but if print data is received from the host device 30, a print process based on the print data is performed as one of the USB communication processes. At this time, if the printer 11 is connected to a power adapter such as the AC adapter 50, the printer 11 performs a printing operation with the power supplied through the power adapter, and if not connected to the power adapter, the printer 11 uses the power of the secondary battery 14. Perform the printing operation.

  As described above, when the first initial process for requesting the bus power is initially performed and the initial process fails, the self-power is switched to and the second initial process for requesting the self-power is performed. USB communication with 30 can be established. For this reason, the user can cause the printer 11 to perform print processing in accordance with an instruction from the host device 30. For example, when the first initial processing is performed and the initial processing completion notification cannot be received and the CPU 24 is in a standby state, the USB communication is not connected any time, and the user instructs the printer 11 by an instruction from the host device 30. The printing process cannot be performed.

  However, according to the present embodiment, when the initial process fails, the self-power is switched and the initial process is performed again, so that the printer 11 and the host device 30 can be more reliably connected by USB. As a result, it is possible to avoid the inconvenience that cannot be printed, and to cause the printer 11 to print according to an instruction from the host device 30.

  In addition, when the first initial process for requesting bus power fails during the charging process while the power is turned off, a value indicating the failure is stored in the memory 25, and then the value read from the memory 25 when the power is turned on is a failure. If it is the value of the effect, the 2nd initial processing which requests | requires self power is performed. For this reason, the USB communication between the printer 11 and the host device 30 is established more quickly than when the first initial process is performed once and the procedure for switching to the self-power and performing the second initial process again is performed. be able to. Therefore, the user can cause the printer 11 to perform printing instructed from the host device 30 relatively quickly after connecting the printer 11 and the host device 30 via the USB cable.

  During the USB communication process, the CPU 24 performs the following process. That is, during the USB communication process, the determination as to whether or not the power supply has been turned off at step S51 and the determination as to whether or not the USB cable has been disconnected at step S52 are repeated until an affirmative determination is obtained in one of these determination processes. Run. For example, if there is a power ON operation in step S51, the process proceeds to step S53 to perform power OFF processing. That is, when the ON state of the second switch 27 is detected by operating the power switch 20A, the CPU 24 instructs the control IC 22 to shut off the third switch 28. Further, when the secondary battery 14 is used as a power source, the CPU 24 instructs the control IC 22 to cut off the first switch 26 as well. After the end of the power OFF process, the CPU 24 shifts the process to a charging process routine when the power is OFF.

  In step S52, if the USB cable is disconnected (affirmative determination), the process proceeds to step S54, the memory is rewritten with a value indicating “success”, and then the routine ends. Thereafter, if the printer 11 is connected to a power adapter such as the AC adapter 50, the printer 11 performs a printing operation with power supplied through the power adapter, and if not connected to the power adapter, the power of the secondary battery 14 is displayed. Perform printing operation with. At this time, the USB communication between the printer 11 and the host device 30 is blocked by disconnecting the USB cable 35. For this reason, when the USB cable is disconnected and the connection with the host device 30 is interrupted and then the USB connection is established with the host device 30, the memory value is set to “success” in the resumed USB communication processing routine (FIG. 10). Since an affirmative determination is made in S42, first initial processing (S45) for requesting bus power is performed.

  Further, when the connection with the host device 30 is continued without disconnecting the USB cable 35 (No determination in S52), and there is a power-off operation (Yes determination in S51), the power-off process (S53) is performed. Later, the process proceeds to a charging process routine (FIG. 8) when the power is turned off. As a result, if the host device 30 and the printer 11 are reconnected by the pull-up (S13), and the memory value is “successful” in which the first initial processing is completed in the previous power-on state before the power-off. The first initial process is performed (S45). On the other hand, if the first initial process fails and the second initial process is “failed”, charging is not performed (S17).

  If the initial process for requesting bus power fails, the initial process is performed with self-power, and the USB cable 35 is connected and the power is turned off while the USB cable 35 is connected, the memory 25 indicates a value indicating failure. Is saved. For this reason, in the charging processing routine at the time of power OFF shown in FIG. 8, since the value of the memory 25 is a value indicating failure (No in S12), the charging activation is turned off (S17). At this time, since the information indicating the failure of the initial processing for the purpose of the USB communication processing while the printer 11 is turned on is used, the charging activation is turned off without trying the first initial processing. For example, when the first initial process is performed, it is possible to suppress the waste of power of the CPU 24 and the reduction of the remaining amount of the secondary battery 14 by continuing to wait for an initial process completion notification that is not sent until a timeout occurs. Can do.

According to the embodiment described in detail above, the following effects can be obtained.
(1) The control circuit 13 performs initial processing (enumeration) when the power switch 20A is in an OFF state and the other party to which the USB connector 12 is connected is the USB battery charger 40 (an example of the first device). Instead, the secondary battery 14 is charged with the power received by the USB connector 12. If the other party to which the USB connector 12 is connected is the host device 30 (an example of the second device), the control circuit 13 performs an initial process and charges the secondary battery 14 after the initial process is completed. . On the other hand, when the other party to which the USB connector 12 is connected is the host device 30 and the initial process fails, the secondary battery 14 is not charged. Therefore, when the power switch 20A is off and the USB connector 12 is connected to the host device 30 and the initialization process fails, the control circuit 13 (especially the CPU 24) can be turned off, and the battery 14 can be stopped before it starts. For this reason, even if the initial process fails, it is possible to suppress waste of electricity and reduction of the remaining amount of the battery 14 due to the control circuit 13 being left in the activated state for a long time.

  (2) The control circuit 13 includes a control IC 22 (an example of a determination circuit) that determines a partner to which the USB connector 12 is connected, and a CPU 24 (an example of a processing circuit) that executes at least a part of the initial processing. If it is determined that the other party to which the USB connector 12 is connected is the USB battery charger 40 (an example of the first device), the CPU 24 is maintained in a power-off state. If it is determined that the other party to which the USB connector 12 is connected is the host device 30 (an example of a second device), the CPU 24 is shifted to the power-on state. Therefore, the CPU 24 that has shifted to the power-on state can perform initial processing with the host device 30.

  (3) In the initial state, when the power switch 20A is on and the USB connector 12 is connected to the host device 30, the control circuit 13 has a larger supply power than the second initial process (initial process requiring self-power). The first initial processing including the request (initial processing for requesting bus power) is performed. After the first initial process is completed (successful), the secondary battery 14 is charged. This charging is performed with relatively large power (second power) supplied after the completion of the first initial processing. That is, this charging is performed by receiving a supply of electric power (second electric power) larger than relatively small electric power (including the case where the supplied electric power is zero) supplied after the completion of the second initial process. On the other hand, when the control circuit 13 fails because the first initial process cannot be completed, the control circuit 13 performs a second initial process for requesting smaller supply power. Therefore, the second initial process can be completed even when the first initial process fails. Therefore, the control circuit 13 can establish communication with the host device 30 via the USB connector 12. In addition, since the secondary battery 14 is not charged using the small supply power after the second initial process is completed, the power for the printer 11 to perform processing such as the printing process is small although the supply power is small. It is relatively easy to secure.

  (4) After performing the second initial process, the control circuit 13 performs the second initial process without performing the first initial process when the connection with the host device 30 is continued. On the other hand, after the second initial process is performed, when the connection with the host apparatus 30 is interrupted after the connection with the host apparatus 30 is interrupted, the process returns to the initial state and the first initial process is started. In this way, when the host device 30 is the same connection partner that has failed the first initial processing once, the first initial processing is not performed and the second initial processing is performed. For this reason, it is possible to suppress the waste of power due to the control circuit 13 performing the first initial process with the same host device 30 that has once failed. On the other hand, if the control circuit 13 is connected to the host device 30 after the connection with the host device 30 is interrupted after performing the second initial processing, the control circuit 13 returns to the initial state and performs the first initial processing. As described above, when there is a possibility that the connection partner of the control circuit 13 is the host device 30 different from the host device that has once failed the first initial processing, the first initial processing is performed after returning to the initial state. At this time, if the first initial process is successful, the secondary battery 14 can be charged with the power supplied from the host device 30. Therefore, the frequency with which the secondary battery 14 is charged can be increased.

  (5) When the power switch 20A is turned off in a state where the connection with the host device 30 is continued after completing the first initial processing, the control circuit 13 performs the first initial processing and performs the first initial processing. After the processing is completed, the secondary battery 14 is charged. In this way, the first initial process is performed after the power is turned off with the same host device 30 that has successfully performed the first initial process in the power-on state. For this reason, if the first initial process is completed, the secondary battery 14 is charged, and if the first initial process fails, the secondary battery 14 is not charged. On the other hand, when the power switch 20 </ b> A is turned off in a state where the connection with the host device 30 is continued after performing the second initial process, the control circuit 13 does not perform the first initial process and does not perform the first initial process. 14 is not charged. In this way, when the first initial process fails in the power-on state and the second initial process is performed, the first initial process is not performed after powering off with the same host device 30 that failed the first initial process. The secondary battery 14 is not charged. Therefore, when the power switch 20A is turned off, it is possible to suppress waste of power due to the control circuit 13 performing the first initial process with the same host device 30 that has once failed the first initial process.

  (6) The control circuit 13 has succeeded in completing the first initial process performed in the off state before the power switch 20A is turned on, or failed in completing the first initial process without completing the first initial process. A value indicating this is stored in the nonvolatile memory 25. After the power switch 20A is turned on, if the stored content of the second storage area 25B of the nonvolatile memory 25 is a value indicating success, the first initial processing is performed. On the other hand, if the stored content of the second storage area 25B of the nonvolatile memory 25 is a value indicating failure, the second initial process is performed without performing the first initial process, and the secondary battery 14 is charged. Absent. Therefore, when the power switch 20A is turned on in a state in which the connection with the host device 30 is continued after the failure of the first initial processing, the same host device in which the control circuit 13 has failed once in the power-off state. It is possible to suppress waste of electric power by performing the first initial processing with 30.

  (7) When the USB connector 12 is connected to the host device 30 in the initial state, the control circuit 13 performs the first initial process, and charges the secondary battery 14 after the first initial process is completed. When the first initial process fails, the secondary battery 14 is not charged. Further, when reconnecting to the host device 30 in a state where the first initial processing is completed and the connection with the host device 30 is continued, the first initial processing is performed and the first initial processing is completed. In addition, the secondary battery 14 is charged. On the other hand, when reconnecting to the host device 30 in a state where the first initial processing fails and the connection with the host device 30 is continued, the first initial processing is not performed and the battery is not charged. Therefore, when reconnecting to the same host device 30 in which the first initial processing has failed, the control circuit 13 generates power by performing the first initial processing with the same host device 30 in which the first initial processing has failed. Waste can be suppressed.

  (8) When the control circuit 13 is connected to the host device 30 after the connection with the host device 30 is interrupted, the first initial process is completed (successful) or the failure before the connection with the host device 30 is interrupted. Regardless of whether or not, the process returns to the initial state and the first initial process is started. Therefore, when connecting to the host device 30 after the connection with the host device 30 is interrupted, there is a possibility that the connection partner is different from the host device 30 before the connection is interrupted (the first initial process may be successful). As a result, the process returns to the initial state and the first initial processing is performed. If the first initial process is successful, the secondary battery 14 can be charged. For example, although the connection with the host device 30 that has failed the first initial processing is disconnected, and the next connected host device 30 may be different from the previous host device, the first initial processing is not performed and the charging is not performed. You can avoid missing opportunities. Therefore, the frequency with which the secondary battery 14 is charged can be increased.

  (9) If the power of the printer 11 is on, the control circuit 13 notifies the class information (printer class (first class)) that the printer is an example of the first type device. Then, the first initial processing is performed as the printer. On the other hand, if the printer 11 is turned off, a notification of class information (HID class (second class)) indicating that the printer is a human interface device (HID) (an example of the second type device) different from the printer is sent. Thus, the first initial processing is performed as HID. Therefore, the host device 30 recognizes the printer 11 in the power-on state as a printer and treats it as a printer. On the other hand, the host device 30 recognizes the printer 11 in the power-off state as HID and treats it as HID. Therefore, the printer 11 in the power-on state is recognized as HID and printing cannot be performed, or the printer 11 in the power-off state is recognized as a printer and print data is transmitted even though the power is off. The inconvenience can be avoided.

  (10) The control circuit 13 performs a second initial process including a power request smaller than that of the first initial process when the first initial process performed with the printer 11 powered on fails. When reconnecting to the host device 30 in a state where the second initial processing is completed and the connection with the host device 30 is continued, if the printer 11 is powered on, the first initial processing is performed. The second initial processing is performed without performing it. Therefore, when reconnecting to the host device 30 in a state where the second initial processing is completed and the connection with the host device 30 is continued, the first initial processing that has failed once with the same host device 30 is not performed. 2 Perform initial processing. Therefore, it is possible to suppress the waste of power of the control circuit 13 due to the first initial processing that has failed once, and to be able to start printing as soon as the first initial processing is omitted, and early printing after reconnection is performed. Can be started.

  (11) The control circuit 13 determines that the first initial process has failed when a timeout occurs in the initial process with the host device 30. For this reason, since the second initial processing can be performed earlier than in the case of waiting until the initial processing completion notification is received without considering the timeout, the communication between the host device 30 and the printer 11 can be performed earlier. Can be established.

  (12) The control circuit 13 sets the timeout time T1 used when determining the timeout, according to the BIOS startup required time (an example of the startup required time) of the host device 30. Therefore, even when the host device 30 to which the USB connector 12 is connected is in the middle of starting, the second power (for example, current) is supplied by supplying power from the host device 30 after performing initial processing with the host device 30 after the startup. The secondary battery 14 can be charged at a value of 500 mA). For this reason, a timeout time that is too short that does not match the required startup time of the host device 30 is set, so that the timeout is determined during the startup of the host device 30 and charging is performed a little while waiting for a while. It is possible to reduce the inconvenience that the battery is not charged due to failure early. Therefore, the frequency with which the secondary battery 14 is charged can be increased.

  (13) In particular, the timeout time T1 is set by adding a predetermined margin time to the longest time required for starting up the plurality of types of host apparatuses 30 to be connected. Therefore, the secondary battery 14 cannot be charged because the first initial process is determined to have failed due to a timeout during the start-up of the host device 30 due to a too short timeout time even though charging was possible after a short wait. It can be suppressed as much as possible. For this reason, the frequency with which the secondary battery 14 is charged can be further increased.

  (14) The timeout time T12 when the power is turned on is set shorter than the timeout time T11 during the initial process when the power is turned off. Therefore, the frequency of charging the secondary battery 14 can be increased while the power is off, and the start delay of the process instructed by the user from the host device 30 to the printer 11 can be suppressed while the power is on.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. In the present embodiment, the CPU 24 determines that the first initial process has failed by another method in addition to the timeout. The configuration of the printer 11 is the same as that of the first embodiment, and only the method for determining failure of the initial process executed by the CPU 24 is partially different. Therefore, the same configuration and common processes as those of the first embodiment are the same. The description will be omitted using reference numerals, and only different parts will be described.

  In the present embodiment, the failure of the initial process is determined not only by the occurrence of a timeout similar to the first embodiment but also by the transition of the host device 30 to the suspended state (paused state). Depending on the type of the host device 30, an SOF (start of frame) signal is transmitted to the printer 11 periodically (for example, every predetermined time of less than 1 millisecond) during USB connection. The SOF signal is a signal transmitted from the host device 30 to the printer 11 at intervals of a predetermined time To within a range of 10 microseconds to 1 millisecond, for example.

  For this reason, the SOF signal is transmitted from the host device 30 to the printer 11 even during the initial processing. When the host device 30 cannot permit the required power (second power) at the bus power included in the configuration information received from the printer 11 in the first initial process, the host device 30 does not set the configuration information and shifts to the suspended state. To do. During the transition to the suspended state, the host device 30 stops transmitting the SOF signal to the printer 11.

  When the SOF signal that should have been sent from the host device 30 during the USB connection with the host device 30 is interrupted, the CPU 24 that constitutes the control circuit 13 in the printer 11 stops the host device 30 from being suspended. It is assumed that the first initial process has failed. In the charging process when the power is turned off, the CPU 24 shifts to the suspended state when the SOF signal that should be sent from the host device 30 is not sent for the set time T2 and stops. 1 Assume that initial processing has failed.

  In this case, if the first initial process fails during the charging process when the power is turned off (FIG. 8), the failure is written in the nonvolatile memory 25 (S16), and then the power of the CPU 24 is turned off. (Charging start-off in S17). If the first initial process fails during the USB communication process when the power is turned on (FIG. 10), the failure is written in the nonvolatile memory 25 and switched to self power (S47), and the reconnection process is performed. After performing (S48), a second initial process for requesting self-power is executed (S49).

  The set time T2 is set to, for example, a certain time that satisfies T2> To in a range of 1 to 10 milliseconds. That is, it is determined that the first initial processing has failed when the SOF signal is interrupted and becomes idle for the set time T2.

  Next, the operation of the printer 11 of the present embodiment will be described with reference to FIG. In FIG. 11, each process of step S31-S34 is the same as each process of step S31-S34 shown in FIG. 9 in 1st Embodiment.

  In step S31, the timer starts counting. In step S32, initial processing (first initial processing) for requesting bus power is performed, and class information (for example, “HID”), power mode information (“bus power”), and a request from the host device 30, The configuration information including the required power information (second power (500 mA in current value)) is transmitted.

  In step S33, it is determined whether an initial processing completion notification has been received. Here, the host device 30 determines whether or not the power supply with the second power requested in the configuration information received in the initial process can be permitted. If the power supply with the second power can be permitted, the host device 30 sets the configuration information and transmits an initial processing completion notification “SetConfiguration” to the printer 11. If the CPU 24 of the printer 11 does not receive the initial process completion notification, the process proceeds to step S34. If the initial process completion notification is received and the first initial process is successful, the CPU 24 proceeds to step S15 (charging process routine in FIG. 8) or The process proceeds to S46 (USB communication processing routine of FIG. 10).

  If the initial process completion notification is not received (No in S33), it is determined in step S34 whether a timeout has occurred. That is, it is determined whether or not the time T of the timer 24A has reached the timeout time T1. If it is not time-out, the process proceeds to step S35, and if it is time-out, the first initial process is regarded as a failure, and the process proceeds to step S16 (charging process routine in FIG. 8) or S47 (USB communication processing routine in FIG. 10).

  In step S35, it is determined whether or not the SOF signal is received for a set time T2 or longer. That is, the CPU 24 determines whether or not the reception of the SOF signal that should have been sent from the host device 30 during the USB connection has been idle for a set time T2 or longer. If the idle state in which reception of the SOF signal is interrupted does not reach the set time T2, the process returns to step S33. If the idle state continues for the set time T2 or longer, it is considered that the first initial process has failed, and step S16 (FIG. 8). Alternatively, the process proceeds to S47 (FIG. 10).

  Steps until one of the determination processes is established, whether the initial process completion notification is received (S33), the time-out is reached (S34), or the SOF signal is not received for the set time T2 (S35). Each process of S33, S34, and S35 is repeated.

  If the SOF signal reception is not interrupted for more than the set time T2 (determined negative in S35) before the timeout is reached (determined negative in S35), and if an initial process completion notification is received (positive determination in S33), the first initial process Is completed, and this is regarded as the success of the first initial processing. If the first initial process is successful and the charging process is in progress when the power is turned off, the process proceeds to step S15 to charge the secondary battery 14 with the second power. On the other hand, if the USB communication process is being performed when the power is turned on, the process proceeds to step S46, where the USB communication process and charging are performed.

  On the other hand, before receiving the initial processing completion notification (determination is negative in S33) before timeout (determination in S34), if reception of the SOF signal is interrupted for a set time T2 or more (determination is positive in S35), the first Consider initial processing failed. In addition, when the initial processing completion notification is not received (No determination in S33), and the reception of the SOF signal is not interrupted for more than the set time T2 (No determination in S35), and when a timeout occurs (Yes determination in S34), the first Consider initial processing failed. If the first initial process fails, if the charging process during power-off (FIG. 8) is in progress, the fact that the failure has occurred is written in the nonvolatile memory 25 (S16), and the charging activation of the CPU 24 is turned off (S17). . On the other hand, if the USB communication process at the time of power ON (FIG. 10) is in progress, the process proceeds to step S46 to perform the USB communication process and charging.

According to the second embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be further obtained.
(15) The CPU 24 of the printer 11 determines that the first initial process has failed when the SOF signal that should be periodically sent from the host device 30 during the USB connection does not exceed the set time T2. For this reason, the failure of the first initial processing can be detected almost in real time without waiting for the timeout time T1 from the time when the CPU 24 is activated. For this reason, in the charging process at the time of power supply 0FF, the failure of the first initial process can be detected at an early stage without waiting for a timeout, and the charging activation of the CPU 24 and the like can be turned off at an early stage when the failure is detected. For this reason, compared with the structure which makes the 1st initial process failure by timeout, the waste of electric power of CPU24 etc. can be suppressed further. For example, a reduction in the remaining amount of the secondary battery 14 due to the control circuit 13 being left in the activated state can be further suppressed. Further, in the USB communication process when the power is turned on, the failure of the first initial process can be detected early without waiting for a timeout, and the initial process (second initial process) for requesting self power can be started early. As a result, the printer 11 can start the USB communication process earlier than the configuration of the first embodiment in which only the timeout is failed. For example, it is possible to cause the printer 11 to start printing instructed by the user from the host device 30 at an early stage.

  (16) As a determination method of the failure of the first initial process, it is determined whether or not the SOF signal that should be periodically sent from the host device 30 is equal to or longer than the set time T2, and the time-out time T1 from the activation point of the CPU 24. A plurality of types of determination methods are used for determining whether or not the process has passed. Therefore, when the host device having the function of transmitting the SOF signal is the connection partner, the failure of the first initial processing can be detected almost in real time, and even the host device having no function of transmitting the SOF signal has a timeout. The failure of the first initial process can be detected.

In addition, each said embodiment can also be changed into the following forms, or can also combine these.
-You may enable it to change timeout time according to a user's operating environment. An operation switch 20B is provided as an example of an operation unit operated for data input, and the control circuit 13 can set a timeout time T1 used when determining a timeout based on an input result obtained by operating the operation switch 20B. It is good also as a structure. In this case, the timeout time T1 may be input and set as a numerical value by operating the operation switch 20B, or a desired one may be selected from the options of the timeout time T1. According to this configuration, it is possible for the user to set an appropriate timeout time T1 suitable for the use environment based on the input result of operating the operation switch 20B. Therefore, because the timeout time that is too short that does not match the BIOS startup time of the host device 30 to be used is set in an unchangeable state, the failure is made a little earlier even though it can be charged after a while. It is possible to reduce the inconvenience that the host device 30 is determined to have timed out during the startup and is not charged. As a result, the frequency with which the secondary battery 14 is charged can be increased.

  Although the timeout time T1 is a constant value, it may be variable. When the partner to which the USB connector 12 is connected is the host device 30 which is an example of the second device, the control circuit 13 acquires the required start time information from the host device 30 or starts the host device 30. The required time may be acquired by measuring with a timer in the control circuit 13, and the timeout time T1 may be set according to the acquired required start time. According to this configuration, the control circuit 13 can set the timeout time T1 according to the acquired required startup time, and thus can set an appropriate timeout time T1 suitable for the use environment of the user. For this reason, a timeout time that is too short that does not match the required startup time of the host device 30 is set, so that the timeout is determined during the startup of the host device 30 and charging can be performed after waiting for a while. Since the timeout (failure) occurred a little earlier, the inconvenience of not being charged can be reduced. As a result, the frequency with which the battery 14 is charged can be increased. In addition, the control circuit 13 stores the data of the maximum M required startup times in the memory 25, and erases the oldest data among the past data exceeding M each time a new startup required time is acquired. A timeout time is set according to the longest required startup time among the M. In addition, data exceeding the preset maximum set time among the past M pieces is not adopted, and the timeout time T1 is set according to the longest required start time among the data of the required start time less than the maximum set time. Good. With these configurations, since the host device 30 that happens to have a very long startup time is connected to the printer 11 only once, an excessively long timeout time based on the very long startup time of the host device 30 is set. Thus, an appropriate timeout time T1 can be set.

  The control circuit 13 measures a value indicating the remaining amount of the secondary battery 14 or a change in the remaining amount, and if the value indicating the remaining amount of the secondary battery 14 or the change in the remaining amount exceeds a threshold value, the initial process fails. You may judge that you did. In this case, the value indicating the change in the remaining amount of the secondary battery may be a change amount or a change rate. According to this configuration, the control circuit 13 determines that the initial process has failed when a value indicating the remaining amount of the secondary battery 14 or a change in the remaining amount (for example, a change amount or a change rate) exceeds a threshold value. . For this reason, it is possible to determine the failure of the initial process without using a timer such as a timer. Further, when the remaining rate of change is used, when the remaining amount of the secondary battery 14 is relatively small, it is determined that the initial process has failed relatively early, and the remaining amount of the secondary battery 14 is relatively If there are many, it is determined that the initial processing has failed relatively late. For this reason, although the remaining amount of the secondary battery 14 is small, it is easy to avoid a situation where the determination of the failure of the initial process is delayed and the remaining amount becomes extremely small. Further, when the timeout time T1 is set according to the remaining amount of the secondary battery 14, for example, when the remaining amount of the secondary battery 14 is less than the threshold, the timeout time T1 is set relatively short, and the remaining amount is If there are many, the timeout time T1 may be set relatively long.

  The timeout time T1 is preferably set to a value corresponding to the longest startup required time (BIOS startup required time) among a plurality of types of host devices 30 that are assumed to be connected. The same time or a time shorter than the BIOS startup time may be set. For example, it may be 1/2 or 1/3 of the BIOS startup time. Moreover, you may set timeout time T1 which does not consider BIOS starting required time. For example, the timeout time T1 may be set to a value not less than the enumeration required time and not more than a time obtained by adding a predetermined margin time (for example, 1 to 10 seconds) to the enumeration required time.

  The timing for starting the timing T is not limited to the time when the CPU is activated (the time when charging is activated). For example, the timer 24A may start timing at the time of USB connection (for example, when USB connection is detected). In this case, for example, if the time is measured by a timer (for example, a counter) in the control IC 22, the time can be started even before the CPU is activated. Alternatively, the timer may be started when a predetermined time elapses from the CPU activation time. For example, a timer may be started from the time when the configuration information is transmitted.

  In the second embodiment, if it is assumed that the host device 30 periodically transmits an SOF signal to the USB device 11A during the USB connection, it is determined whether or not a timeout has occurred in the flowchart shown in FIG. The process (S34) may be abolished.

  If the initial state is bus power, there is no user setting for setting the power mode by operating the operation switch 20B. Further, the configuration for storing the success / failure of the first initial process in the nonvolatile memory may be eliminated. In this case, the initial process first performs the first initial process, and if the first initial process fails, the second initial process is performed.

In FIG. 10, USB communication processing and charging are performed while the power is on, but a configuration in which charging is not performed may be employed.
In each of the embodiments, the first initial process requires bus power and the second initial process requires self power. However, both the first initial process and the second initial process require bus power, and The two initial processes may include a request for smaller power supply than the first initial process. For example, the first initial processing may be bus power and 500 mA, and the second initial processing may be bus power and 100 mA.

  The electric power supplied from the external device to the electronic device is not limited to use for charging the secondary battery 14. When the electronic device is a printer, for example, power supplied from an external device may be used for a printing operation of the printing mechanism 16, for example. When the electronic device is a scanner device, for example, power supplied from an external device may be used for, for example, a document reading operation.

When the power source is switched from ON to OFF or from OFF to ON, the control circuit may return to the initial state even if the control circuit continues to connect to the external device.
The USB standard is not limited to USB 2.0, but may be applied to USB 3.0 and USB 3.1. Moreover, you may apply to USB1.0 or USB1.1. Further, the present invention is not limited to the USB standard, and may be applied to other communication standards. In short, the initial processing is performed between the host device and the electronic device, and the initial processing is completed by receiving the initial processing completion notification (notification corresponding to “Set Configuration” of the USB standard) as a trigger. Any other communication standard may be used as long as it is configured to receive power necessary for charging from the host device upon completion. For example, IEEE 1394, SCSI (Small Computer System Interface), or ATA (Advanced Technology Attachment) may be used. The communication method is not limited to the wired communication method, and may be a wireless communication method as long as power can be supplied from the host device to the electronic device.

  The power switch 20A is not limited to the push type, and may be a toggle type. In addition, any switch that can be operated so as to be able to switch the power on and off may be used. Further, a sensor type power switch may be used, and a contact sensor type or non-contact sensor type power switch may be used.

  The control circuit is configured to include a control IC 22 configured by hardware and software by a CPU that executes a program. However, the control circuit may be realized by hardware using an electronic circuit such as the control IC 22 or ASIC, or only by software. It may be realized.

  The printer (printing apparatus) is not limited to a dedicated printing machine, but may be a multifunction machine having a copy function and a scanner function. Furthermore, the printer may be any of a page printer in addition to a serial printer and a line printer. The printer may be a portable type, a small size, a medium size printer, or a large size printer. For example, a business printer or a large format printer may be used.

  The electronic device is not limited to a printer (including a multifunction device) but may be a scanner, a projector, a digital camera (imaging device), a digital audio device (acoustic device), or the like.

  DESCRIPTION OF SYMBOLS 11 ... Printer as an example of an electronic device, 12 ... USB connector as an example of a communication circuit, 13 ... Control circuit, 14 ... Secondary battery as an example of a rechargeable battery, 15 ... Drive circuit, 16 ... Printing mechanism, 20A ... Power switch, 20B ... Operation switch as an example of an operation unit, 22 ... Control IC as an example of a determination circuit, 23 ... Power supply circuit, 24 ... CPU as an example of a processing circuit, 25 ... Memory, 26 ... First Switch, 30... Host device as an example of external device and second device, 35... USB cable as an example of communication cable, 40... USB battery charger as an example of external device and first device, T1. Setting timeout time as an example, T2... Setting time.

Claims (12)

A communication circuit connected to an external device for communication and receiving power supply;
A control circuit;
A power switch, and
When the communication circuit is connected to an external device in an initial state, the control circuit
The first initial process is performed, and after the first initial process is completed, power is supplied from the external device,
When the first initial process fails, no power is supplied from the external device,
When reconnecting with the external device in a state where the first initial processing is completed and the connection with the external device is continued, the first initial processing is performed and the first initial processing is completed. Receiving power supply from the external device,
When reconnecting with the external device while the first initial processing fails and the connection with the external device is continued, the first initial processing is not performed and power is supplied from the external device. No electronic equipment characterized by that.   When the control circuit is connected to the external device after the connection with the external device is interrupted, the control circuit is initialized regardless of whether the first initial processing is completed or failed before the connection with the external device is interrupted. The electronic apparatus according to claim 1, wherein the electronic device is returned to a state and the first initial process is started.   The control circuit performs a first initial process as a first type device when the power is on, and a first initial process as a second type device different from the first type device when the power is off. The electronic device according to claim 1, wherein:   The control circuit performs a second initial process including a request for power smaller than the first initial process when the power is on and the first initial process fails, and the second initial process is completed and the external When reconnecting with an external device while the connection with the device is continuing, if the power is on, the second initial processing is performed without performing the first initial processing. The electronic device as described in any one of Claims 1 thru | or 3.   5. The electronic device according to claim 1, wherein the control circuit determines that the first initial process has failed when a timeout occurs in the first initial process. 6. .   6. The control circuit according to claim 1, wherein the control circuit determines that the first initial processing has failed because a signal that should be sent from an external device is not sent periodically. The electronic device as described in any one.   The control circuit sets the time-out time used when determining the time-out as such that the value when the power is on is shorter than the value when the power is off. 5. The electronic device according to 5.   8. The electronic apparatus according to claim 7, wherein the control circuit sets a time-out period used when determining the time-out when the power is off in accordance with a time required for starting the external device. . It has an operation unit that is operated to input data,
9. The electronic device according to claim 5, wherein a timeout time used when the control circuit determines occurrence of the timeout is set based on an operation of the operation unit. machine.   9. The control circuit according to claim 8, wherein the control circuit acquires the required startup time from the external device connected via the communication circuit, and sets the timeout time to a value corresponding to the required startup time. The electronic device described.   The control circuit measures a value indicating the remaining amount of the battery or a change in the remaining amount, and determines that the initial processing has failed when the value indicating the remaining amount of the battery or the change in the remaining amount exceeds a threshold value. The electronic device according to claim 1, wherein the electronic device is characterized in that:   The electronic device according to claim 1, wherein the battery is charged with electric power supplied from an external device.