JP2001251783A - Momentary power interruption controller, portable terminal unit and method for controlling momentary power interruption - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control operation by accurately detecting momentary short power interruption. SOLUTION: A power source control circuit 12 sets a momentary power interruption signal, to be sent to a momentary power interruption counter 13 from an 'L' to an 'H' for a prescribed time, when a voltage monitor signal sent from a voltage monitoring circuit 14 becomes an 'L' from an 'H'. The counter 13 starts counting of a clock signal supplied from an RTC circuit 11, according to a momentary power interruption detection signal. The circuit 12 sets a reset signal to be sent to a CPU 9 from 'L' to 'H', when the voltage monitor signal sent from the circuit 14 is set from 'L' to 'H'. The CPU 9 specifies number of clock signals counted by the counter 13, when the reset signal is set from 'L' to 'H', and judges whether a drop of the power source voltage corresponds to the power interruption. The CPU 9 switches the operation according to the judged result, to accurately detect the power interruption and to control the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instantaneous interruption control device for controlling an operation when an electric power supply is instantaneously interrupted, and a portable terminal device to which the same is applied. The present invention relates to an instantaneous interruption control device that can be controlled and a portable terminal device to which the instantaneous interruption control device is applied.

[0002]

2. Description of the Related Art As a drive power source for a portable terminal device such as a mobile telephone device, a device using a storage battery such as a lithium ion secondary battery or a nickel hydride secondary battery is employed. In such a mobile terminal device, a so-called instantaneous interruption may occur in which the power supply voltage drops for a short time of about several seconds due to an impact such as a drop. For example, in the case where such an instantaneous interruption occurs in a mobile telephone device in a communication state, there is a method in which a decrease in power supply voltage is detected and initialization is immediately performed, even though the communication state up to that time can be continued. According to such a mobile telephone device, when an instantaneous interruption occurs, the user must always operate the mobile telephone device to instruct the transition to the communication state again, which is inconvenient.

In this regard, Japanese Patent Laid-Open Publication No. Hei 9-247076 discloses a wireless communication device having a function of detecting an instantaneous interruption of battery voltage. This wireless communication device identifies the momentary interruption period based on the discharge characteristics of the capacitor,
Detect the occurrence of a momentary interruption.

As a circuit for detecting occurrence of such an instantaneous interruption, a circuit having a configuration as shown in FIG. 4 can be considered. According to this circuit, when detecting a decrease in the power supply voltage, the power supply control circuit 200 opens the gate G100 to apply the power supply voltage _VCC to the capacitor C100. When the capacitor C100 is charged, the power supply control circuit 200 closes the gate G100.

[0005] The capacitor C100 discharges the charged electric charge through the resistor R100 according to a predetermined time constant. The voltage comparison circuit K100 calculates a voltage value generated by charging / discharging of the capacitor C100 and a power supply voltage V
The voltage of _CC is divided by resistors R110 and R111, and the voltage is compared with a predetermined voltage value. Voltage comparison circuit K
100 determines that the instantaneous interruption flag is "" when the voltage value generated by the capacitor C100 is larger than the predetermined voltage value.
H ”to notify an external control circuit or the like that an instantaneous interruption has occurred. On the other hand, when the voltage comparison circuit K100 determines that the voltage value generated by the capacitor C100 is less than the predetermined voltage value, The instantaneous interruption flag is reset to “L” to notify the control circuit or the like that the generated drop in the power supply voltage is not an instantaneous interruption.

[0006]

In the prior art described above, when a circuit having a configuration as shown in FIG. 4 is used, the instantaneous interruption detection period serving as a reference for detecting occurrence of an instantaneous interruption depends on the discharge characteristics of the capacitor. It is determined. Therefore, when the circuit having the configuration shown in FIG. 4 is used, the capacitor C100 and the resistor R100, or the resistor R110 and the resistor R111 in FIG. I had to.

The capacity of the capacitor C100 and the resistance R
Since a resistance value of 100 or the like has an error for each component, there is a problem that an instantaneous interruption detection period serving as a reference of instantaneous interruption occurrence varies.

Further, when the occurrence of an instantaneous interruption is detected by utilizing the discharge characteristics of a capacitor as shown in Japanese Patent Application Laid-Open No. 9-247076 and FIG. In some cases, a sufficient current for charging the capacitor cannot be obtained due to, for example, executing a process for stopping the operation. When the current for charging the capacitor is insufficient in this way, even when the power supply voltage decreases for a shorter time than the reference instantaneous interruption detection period, the portable terminal device does not determine this as an instantaneous interruption, There is a problem that the operation is initialized.

The present invention has been made in view of the above circumstances, and provides an instantaneous interruption control device capable of accurately detecting an instantaneous interruption and controlling operation, and a portable terminal device to which the instantaneous interruption control device is applied. Aim. Another object of the present invention is to provide an instantaneous interruption control device capable of easily changing an instantaneous interruption detection period serving as a reference when detecting an instantaneous interruption, and a portable terminal device to which the instantaneous interruption control device is applied.

[0010]

According to a first aspect of the present invention, there is provided an instantaneous interruption control apparatus comprising: a power supply including a battery; a time measuring means for measuring a current time; Counting means for counting the clock signal supplied from the power supply, count control means for causing the counting means to start a counting operation upon detecting a decrease in the voltage value output from the power supply, and processing based on the count value of the counting means. And processing means for executing

According to the present invention, when the voltage value output from the power supply decreases, the counting means starts the counting operation and counts the clock signal supplied from the time measuring means, so that the length of time during which the voltage value decreases is maintained. The operation can be controlled by the processing means executing the processing based on the count value of the counting means.

More specifically, the count control means includes:
It is preferable that it is determined whether or not the voltage value output from the power supply is less than a predetermined reference value, and when it is determined that the voltage value is less than the reference value, the counting means starts the counting operation.

More specifically, the count control means determines whether or not a voltage value output from the power supply is less than a predetermined reference value, and generates a voltage monitoring signal indicating the determination result. And an operation control means for controlling activation and stop of the counting means and the processing means according to the voltage monitoring signal generated by the voltage monitoring means. Further, it is preferable that the operation control means generates a voltage drop detection signal according to a voltage monitoring signal, and the counting means starts a counting operation in accordance with the voltage drop detection signal generated by the operation control means.

More specifically, the counting means includes: a flag setting means for setting an instantaneous interruption detection flag in accordance with a voltage drop detection signal generated by the operation control means;
When the instantaneous interruption detection flag is set by the flag setting means, counting of the clock signal supplied from the timing means is started, and a carry indicating whether or not the number of clock signals corresponding to a predetermined number of digits has been counted. Carry-counting means for generating a signal, wherein the flag setting means detects an instantaneous interruption when the carry signal generated by the carry-counting means indicates that a predetermined number of clock signals have been counted. It is desirable to reset the flag.

The power supply includes a main power supply battery for supplying electric power when the processing means executes processing, and the time counting means and the count when the voltage output from the main power supply battery decreases. And a backup power supply battery for supplying power to the count control means.

Also, a portable terminal device according to a second aspect of the present invention has a recording unit for recording a processing program, a processing unit for executing processing according to the processing program recorded in the recording unit, a battery, A power supply including: a clock signal generating means for measuring a current time by generating a clock signal; a voltage drop detecting means for detecting whether a voltage value supplied from the power supply is less than a predetermined reference value; Counting means for counting a clock signal generated by the clocking means when the voltage drop detecting means detects that a voltage value supplied from a power supply is less than a reference value, wherein the processing means When the voltage drop detecting means detects that the voltage value to be returned has returned to the reference value or higher, the number of clock signals counted by the counting means is specified. Reduction of the voltage value supplied from the power source is determined whether or not instantaneous interruption, switches the operation in accordance with the determination result, characterized in that.

According to the present invention, when the voltage value output from the power supply is less than the predetermined reference value, the counting means counts the clock signal generated by the time counting means. When the voltage value supplied from the power supply recovers, the processing means determines whether the drop in the voltage value supplied from the power supply is an instantaneous interruption by specifying the clock signal counted by the counting means and operates. Switch. Thus, the processing means can accurately detect the instantaneous interruption and control the operation.
Further, since the operation of the processing means is defined by the processing program recorded in the recording means, by changing the processing program, the instantaneous interruption detection period serving as a reference when detecting an instantaneous interruption can be easily changed. be able to.

For example, when the processing means determines that the decrease in the voltage value supplied from the power supply is an instantaneous interruption, it is desirable to execute a process for recovering from the instantaneous interruption. Further, when the processing unit determines that the decrease in the voltage value supplied from the power supply is not an instantaneous interruption, the power supply may be turned off to stop the power supply.

More specifically, the processing means determines whether or not the number of clock signals counted by the counting means is less than a predetermined reference count, thereby determining a voltage supplied from the power supply. It is desirable to determine whether the decrease in the value is an instantaneous interruption.

[0020] The processing means may include wireless communication means for transmitting and receiving a radio signal to perform communication.

Further, in the instantaneous interruption control method according to a third aspect of the present invention, it is determined whether or not a voltage value supplied from a power supply is less than a reference value.
The clock signal generated for measuring the current time is counted, and when the voltage value supplied from the power supply returns to a reference value or more, the number of clock signals counted is specified, and the voltage supplied from the power supply is specified. It is characterized in that it is determined whether or not the decrease in the value corresponds to an instantaneous interruption, and the operation is switched according to the result of the determination.

More specifically, it is determined whether or not the number of the specified clock signals is less than a predetermined reference count number, thereby determining whether or not the decrease in the voltage value supplied from the power supply corresponds to an instantaneous interruption. It is desirable to determine whether.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mobile telephone device as an example of a portable terminal device to which an instantaneous interruption control device according to an embodiment of the present invention is applied will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of the mobile telephone device 100. As shown in FIG. As shown in FIG.
0 denotes an antenna 1, an RF (Radio Frequency) signal transmitting / receiving circuit 2, a baseband signal processing circuit 3, a ROM (Read Only Memory) 4, and a RAM (Rand Rand).
om Access Memory) 5, an input key 6, a display 7,
Audio codec 8 and CPU (Central Processing Uni
t) 9, the clock control circuit 10, and the RTC (R
eal Time Clock) circuit 11, a power control circuit 12, an instantaneous interruption counter 13, a voltage monitoring circuit 14, a power supply circuit 15, a main power supply battery 16, and a backup battery 17.

The RF signal transmitting / receiving circuit 2 has an LNA (Low No.
ise Amplifier), HPA (High Power Amplifier),
It is composed of a frequency converter and the like, amplifies the communication signal received by the antenna 1, converts the frequency, and sends it to the baseband signal processing circuit 3. Further, the RF signal transmitting / receiving circuit 2
The modulated signal received from the baseband signal processing circuit 3 is converted into a communication signal in a radio frequency band and supplied to the antenna 1 to transmit a radio signal.

The baseband signal processing circuit 3 has an AGC
(Automatic Gain Control) An amplifier, a quadrature modulator / demodulator, a roll-off filter, and the like. The baseband signal is demodulated from a communication signal received from the RF signal transmission / reception circuit 2 and supplied to the audio codec 8 and the CPU 9. Further, the baseband signal processing circuit 3 includes an audio codec 8
A modulated signal is generated by modulation based on a signal received from the CPU 9 or the CPU 9 and sent to the RF signal transmitting / receiving circuit 2.

The ROM 4 is an EEPROM (Electronical).
It is composed of a semiconductor memory such as ly Erasable and Programmable ROM, and records a processing program executed by the CPU 9 and nonvolatile data such as telephone directory data.

The RAM 5 is composed of a semiconductor memory such as an SRAM (Static RAM). When the CPU 9 executes a processing program recorded in the ROM 4, a part of the processing program and data necessary for the processing are temporarily stored. To record.

The input key 6 is constituted by a keypad or the like, and inputs a data signal indicating a telephone number, character information and the like, an instruction for switching an operation mode, and the like to the mobile telephone device 100 in accordance with a user operation. I do.

The display 7 is a liquid crystal display (LCD).
play), and displays information such as an image showing the result of the execution of the processing program recorded in the ROM 4 by the CPU 9.

The voice codec 8 is a voice PCM (Pulse
It is composed of a modulator / demodulator, etc., decodes the received baseband signal received from the baseband signal processing circuit 3, and outputs sound from a speaker (not shown). The audio codec 8 encodes an audio signal input from a microphone (not shown) to create a transmission baseband signal, and sends the transmission baseband signal to the baseband signal processing circuit 3.

The CPU 9 comprises a one-chip microprocessor or the like, and controls the operation of the entire mobile telephone device 100. Here, the CPU 9 receives the supply of the reset signal from the power supply control circuit 12, and executes the processing program recorded in the ROM 4 when the reset signal is “H”. On the other hand, the CPU 9 stops the operation when the reset signal received from the power control circuit 12 is “L”.

At the time of activation, the CPU 9 reads the count value of the instantaneous interruption counter 13 and executes a process based on the read count value. More specifically, the CPU 9
Determines whether an instantaneous interruption has occurred by comparing the read count value with a predetermined reference count number, and executes a process for recovering from the instantaneous interruption when it is determined that an instantaneous interruption has occurred. On the other hand, when the CPU 9 determines that the instantaneous interruption has not occurred, the CPU 9 executes a process for turning off the power supply and stopping the supply of the electric power.

The clock control circuit 10 is composed of a crystal oscillation circuit, a PLL (Phase Locked Loop) circuit and the like, and generates a clock signal that defines the operation timing of the audio codec 8 and the CPU 9. The clock control circuit 10 sends the generated clock signal to the audio codec 8 and the CPU 9.

The RTC circuit 11 is composed of a clock IC (Integrated Circuit) including an oscillation circuit and the like, and is a circuit for measuring the current time (for example, date, hour, minute, second). Here, the RTC circuit 11 also receives the power supply from the backup battery 17 in order to continue the time measurement even when the power supply from the main power supply battery 16 is stopped. Further, RTC circuit 11 generates a clock signal for measuring the time, as well as use in the measurement of time, 2 provided in the interruption counter 13 ⁿ Counter 2
Feed to 1. For example, the RTC circuit 11 has 32768
A clock signal of 1 Hz is generated and supplied to the ²ⁿ counter 21.

The power supply control circuit 12 generates a reset signal according to the voltage monitoring signal sent from the voltage monitoring circuit 14 and sends it to the baseband signal processing circuit 3 and the CPU 9.
That is, when the voltage monitoring signal sent from the voltage monitoring circuit 14 becomes “L” indicating a drop in the power supply voltage while the baseband signal processing circuit 3 and the CPU 9 are operating, the power supply control circuit 12 Then, the reset signal sent to the CPU 9 is set to “L” to stop the operations of the baseband signal processing circuit 3 and the CPU 9. On the other hand, when the power supply voltage supplied from the power supply circuit 15 is stabilized, the power supply control circuit 12
The baseband signal processing circuit 3 and the CPU 9 are activated by setting the reset signal to be sent to 9 to “H”.

The power supply control circuit 12 generates a power-on signal in accordance with the voltage monitoring signal sent from the voltage monitoring circuit 14 and sends it to the power supply circuit 15. That is, the power supply control circuit 12 includes the CPU 9 and the baseband signal processing circuit 3
When the voltage monitoring signal sent from the voltage monitoring circuit 14 becomes “L” during the operation of the power supply circuit 15, the power supply ON signal sent to the power supply circuit 15 is set to “L”, and the supply of power from the power supply circuit 15 is stopped. On the other hand, the power supply control circuit 12 starts supplying power from the power supply circuit 15 to each part by sending the power supply ON signal to the power supply circuit 15 as “H”.

The instantaneous interruption counter 13 is provided with the main power supply battery 1.
6 is for measuring a period in which the instantaneous interruption continues when the instantaneous interruption in which the power supply amount is reduced occurs. In order to realize such a function, the instantaneous interruption counter 13 includes a D latch 20 and a ²ⁿ counter 21, as shown in FIG.

[0039] D latch 20, the clock input CK _D is connected to the power supply control circuit 12 receives the interruption detection signal from the power control circuit 12. Here, D latch 20 receives an instantaneous interruption detection signal from the power control circuit 12 by the clock input CK _D. Further, a voltage _VDD supplied from the main power supply battery 16 or the backup battery 17 is input to the data input D of the D latch 20. The D latch 20 sets the instantaneous interruption detection flag supplied from the output terminal Q to the power supply control circuit 12 and the ²ⁿ counter 21 to “H” in accordance with the instantaneous interruption detection signal received from the power supply control circuit 12 by the data input D. Further, the reset input _{R D} of the D latch 20, 2
The carry signal output from carry output CRY of ⁿ counter 21 is inverted and input. That is, the D latch 2
0 indicates that the instantaneous interruption detection signal sent from the power control circuit 12 is “
H ”, the instantaneous interruption detection flag is set and held,
^{When a} carry occurs in the ⁿ counter 21, the instantaneous interruption detection flag is reset to “L” by resetting.

The ²ⁿ counter 21 counts the number of clock signals received from the RTC circuit 11 to measure the instantaneous interruption period. The count output CNT of the 2 ⁿ counter 21 is connected to the CPU 9 and the 2 ⁿ counter 2
1 notifies the CPU 9 of the counted value of the clock signal. Here, ^{2 n} counter 21 the clock input _{CK 2n}
Are connected to the RTC circuit 11 and receive a clock signal. The reset input of the ^{2 n} counter 21 _{R 2n}
Are connected to the output terminal Q of the D latch 20. That is, the 2 ⁿ counter 21 outputs the output terminal Q of the D latch 20
When the instantaneous interruption detection flag output from is set to "H", the counting operation is started. When the instantaneous interruption detection flag is reset to "L", the count output CNT is reset and the counting operation is completed. I do. The ²ⁿ counter 21 has a carry output CRY and supplies a carry signal to the D latch 20.

The voltage monitoring circuit 14 monitors the voltage when the power supply circuit 15 supplies power to each part, and determines whether the voltage value is equal to or higher than a predetermined reference value. The voltage monitoring circuit 14 sends a voltage monitoring signal corresponding to the determination result to the power supply control circuit 12 to notify the result of determining whether the voltage value is equal to or higher than a predetermined reference value. For example, when the voltage monitoring circuit 14 determines that the voltage value is equal to or higher than the predetermined reference value, it sends the voltage monitoring signal “H” to the power supply control circuit 12. On the other hand, the voltage monitoring circuit 14
Determines that the voltage value is less than the predetermined reference value, sends the voltage monitoring signal to the power control circuit 12 as “L”.

The power supply circuit 15 is composed of a switching regulator and the like, and regulates the output voltage of the main power supply battery 16 to a voltage value corresponding to each part of the mobile telephone device 100.

The main power supply battery 16 is composed of a lithium ion secondary battery, a nickel hydride secondary battery and the like, and is a power supply for supplying power for the mobile telephone device 100 to execute a normal operation.

The backup battery 17 is composed of a button-type lithium battery or the like. When the power supply from the main power supply battery 16 is stopped, the backup battery 17 supplies electric power for enabling the RTC circuit 11 to continue measuring the current time. It is for supply. Here, when the power supply from the main power supply battery 16 is stopped, the backup battery 17
In addition to the C circuit 11, the power control circuit 12 and the instantaneous interruption counter 13
Also, by supplying power to the power supply, it is possible to measure an instantaneous interruption period when an instantaneous interruption occurs.

The operation of mobile telephone device 100 according to the embodiment of the present invention will be described below. This mobile telephone device 1
Reference numeral 00 denotes a device that can detect and operate the instantaneous interruption appropriately with a simple configuration by counting clock pulses and measuring the instantaneous interruption time.

The mobile telephone device 100 is activated, for example, by pressing a power key (not shown) of the input key 6, and performs communication by transmitting and receiving radio signals. For example, the RF signal transmitting / receiving circuit 2 amplifies a radio frequency band communication signal received by the antenna 1, converts the frequency, and sends the signal to the baseband signal processing circuit 3. The baseband signal processing circuit 3 demodulates a received baseband signal from the communication signal received from the RF signal transmission / reception circuit 2 and sends the demodulated baseband signal to the audio codec 8 and the CPU 9. The audio codec 8 decodes the received baseband signal received from the baseband signal processing circuit 3 and outputs audio from, for example, a speaker (not shown) according to the obtained data. Also, the CPU 9
Decodes the received baseband signal received from the baseband signal processing circuit 3 and, for example, causes the display 7 to display an image indicating predetermined information according to the obtained data.

On the other hand, the audio codec 8 and the CPU 9 generate a transmission baseband signal indicating information input from a speaker (not shown) or the input key 6 and send it to the baseband signal processing circuit 3. The baseband signal processing circuit 3 converts a local oscillation signal of a predetermined frequency into a QPSK (Quadr
A communication signal is generated by performing modulation such as re-phase shift keying) and transmitted to the RF signal transmitting / receiving circuit 2. The RF signal transmitting / receiving circuit 2 converts the frequency of the communication signal received from the baseband signal processing circuit 3, amplifies the signal power, and then supplies the signal to the antenna 1 to transmit a wireless signal.

Here, when the mobile telephone device 100 starts communication, a power-on instruction is input, for example, by pressing a power key (not shown) provided in the input key 6. Then, the power supply control circuit 12 detects the input of the instruction via the CPU 9 and sets the power-on signal sent to the power supply circuit 15 to “H”.

The power supply circuit 15 outputs a power-on signal of “
When it is detected that the signal has changed to "H", an operation such as switching is started, the output voltage of the main power supply battery 16 is regulated to a predetermined voltage value, and supplied to each part of the mobile telephone device 100.

When the power supply voltage supplied from the power supply circuit 15 is stabilized, the power supply control circuit 12 sets the reset signal sent to the baseband signal processing circuit 3 and the CPU 9 to "H" to perform the above-described communication. Instructs the start of processing.

After the baseband signal processing circuit 3 and the CPU 9 start operating, the voltage monitoring circuit 14 monitors the voltage value when the power supply circuit 15 supplies power to each part, and the voltage value is set to a predetermined reference value. It is determined whether the value is equal to or more than the value.

The voltage monitoring circuit 14 notifies the state of the power supplied from the main power supply battery 16 by sending a voltage monitoring signal indicating the determination result to the power supply control circuit 12.
For example, when the voltage monitoring circuit 14 determines that the voltage value is equal to or higher than the predetermined reference value, it sets the voltage monitoring signal sent to the power supply control circuit 12 to “H”. On the other hand, when determining that the voltage value is less than the predetermined reference value, the voltage monitoring circuit 14 sets the voltage monitoring signal to “L”.

When the voltage monitoring signal sent from the voltage monitoring circuit 14 changes from “H” to “L”, the power supply control circuit 12 changes the reset signal supplied to the baseband signal processing circuit 3 and the CPU 9 to “L”. "H" is determined.

The power supply control circuit 12 outputs the reset signal "
If it is determined to be L ", it is determined that the CPU 9 and the like have stopped operating, and no particular operation is performed.

On the other hand, when the power supply control circuit 12 determines that the reset signal is “H”, the power control circuit 12 determines that the baseband signal processing circuit 3 and the CPU 9 and the like are operating, and outputs an instantaneous interruption detection signal to the instantaneous interruption counter 13. , For example, for a predetermined time "
H ”.

When the instantaneous interruption detection signal sent from the power supply control circuit 12 changes from "L" to "H", the instantaneous interruption counter 13 receives the clock input CKD from the _D latch 20 and supplies the data to the data input D. Using the supplied voltage _VDD , an instantaneous interruption detection flag output from the output terminal Q is set to “H” in accordance with the instantaneous interruption detection signal. Instantaneous interruption detection flag, along with being transmitted to the power supply control circuit 12, is supplied to the reset input _{R 2n} of ^{2 n} counter 21.

[0057] ^{2 n} counter 21, reset input _{R 2n}
Is set from "L" to "H", the counting operation is started, and the clock signal sent from the RTC circuit 11 is counted up. here,
When counting the clock signal sent from the RTC circuit 11 by a predetermined number of digits, the ²ⁿ counter 21 determines that a predetermined time has elapsed since the instantaneous interruption detection flag was set to “H”, and Output CRY to D latch 2
The carry signal sent to 0 is "H".

When the carry signal received from the ²ⁿ counter 21 changes from "L" to "H", the D latch 20 resets the instantaneous interruption detection flag to "L". That is, D
When the carry signal indicates that a predetermined number of clock signals have been counted, the latch 20 resets the instantaneous interruption detection flag.

The ²ⁿ counter 21 sets the instantaneous interruption detection flag to “
When reset from “H” to “L”, the count output CN
T is reset to stop the counting operation.

Further, while the carry signal is “L”, for example, when the voltage monitoring circuit 14 detects an increase in the voltage value output from the power supply circuit 15 and the voltage monitoring signal becomes “H”, the power supply the control circuit 12 includes, ^{2 n} counter 2 by instantaneous interruption detection flag fed from the D latch 20 is "H"
1 recognizes that it is operating.

The power supply control circuit 12 sends a power-on signal to the power supply circuit 15 to start the CPU 9 because the power supply voltage has risen while the ²ⁿ counter 21 is operating.
After that, the reset signal sent to the CPU 9 is set to “H.” This activates the CPU 9 and activates the ²ⁿ counter 2.
The count value output from the count output CNT of 1 is read. In this way, the CPU 9 can specify the length of time during which the power supply voltage has dropped by reading the count value obtained by counting the clock signal by the ²ⁿ counter 21.

When reading the count value from the count output CNT of the ²ⁿ counter 21, the CPU 9 controls the instantaneous interruption counter 13 to reset the instantaneous interruption detection flag from "H" to "L".

The CPU 9 determines, based on the count value read from the count output CNT of the ²ⁿ counter 21, whether or not the generated drop in the power supply voltage corresponds to an instantaneous interruption. For example, the CPU 9 determines whether or not the count value read from the count output CNT of the ²ⁿ counter 21 is less than a predetermined reference count.

That is, the CPU 9 sets the 2n counter 21
By determining the number of clock signals counted by the power supply circuit 15, it is determined whether or not a decrease in the voltage value generated when the power supply circuit 15 supplies power corresponds to an instantaneous interruption.

When the CPU 9 determines that the count value read from the count output CNT is less than the predetermined reference value, it determines that the generated drop in the power supply voltage corresponds to an instantaneous interruption.
Executes recovery processing when an instantaneous interruption occurs. When the return process upon occurrence of the instantaneous interruption is completed, the CPU 9 reads the processing program recorded in the ROM 4 and can continue the process before the instantaneous interruption.

On the other hand, when the CPU 9 determines that the count value read from the count output CNT is equal to or greater than the predetermined reference value, the CPU 9 controls the power supply control circuit 12 assuming that the drop in the power supply voltage does not correspond to an instantaneous interruption. Power supply circuit 15
The power-on signal to be sent to “L” is set to “L”, and the power is turned off. As described above, the CPU 9 switches the operation by executing the processing according to the result of determining whether the drop in the power supply voltage corresponds to the instantaneous interruption.

Next, as a specific example, the operation of the mobile telephone device 100 when the voltage when the power supply circuit 15 supplies power changes as shown in FIG. 3A will be described with reference to FIGS.
This will be described with reference to FIG. Here, it is assumed that the voltage value output from the power supply circuit 15 during normal operation is 3 V, and the voltage value serving as a reference when the voltage monitoring circuit 14 switches the voltage monitoring signal is 2.5 V.

[0068] In this case, the voltage output from the power supply circuit 15 at the timing _{T A} is less than 2.5V,
The voltage monitoring circuit 14 switches the voltage monitoring signal shown in FIG. 3B from “H” to “L”.

At this time, when the power supply control circuit 12 detects that the voltage monitoring signal has changed from “H” to “L”,
The instantaneous interruption detection signal shown in (c) is set to “H” for a predetermined time, and the D latch 20 holds this, and sets the instantaneous interruption detection flag shown in FIG. 3D from “L” to “H”. I do.

When the voltage monitoring signal changes from “H” to “L”, the power supply control circuit 12 changes the power-on signal sent to the power supply circuit 15 from “H” to “H” as shown in FIG. L ”, the supply of power is stopped. Further, as shown in FIG. 3F, the power supply control circuit 12 stops the operation by changing the reset signal sent to the baseband signal processing circuit 3 and the CPU 9 from “H” to “L”.

The ²ⁿ counter 21 sets the instantaneous interruption detection flag to “
Since it has been set from “L” to “H”, the count operation of the clock signal supplied from the RTC circuit 11 is started and the count value obtained by counting the clock signal from the count output CNT as shown in FIG. Is output.

[0072] After this, the voltage value supplied from the power supply circuit 15 rises, the reference value at the timing _{T B} (2.5
V) or more, the voltage monitoring signal shown in FIG. 3B changes from “L” to “H”. Here, the timing _{T B}
Here, it is assumed that the carry of the ²ⁿ counter 21 has not yet occurred.

The power supply control circuit 12 sets the voltage monitoring signal to "
The power-on signal is changed from "L" to "H".
From “L” to “H”, the power supply circuit 15 is instructed to start power supply.

Thereafter, when the power supplied from the power supply circuit 15 is stabilized, the reset signal shown in FIG.
From “L” to “H”, the baseband signal processing circuit 3 and the CPU 9 are started up.
The power supply control circuit 12 changes the power-on signal from “L” to “H”.
At timing _{T C} which has elapsed 100 milliseconds from the time _{T B} which was, a reset signal "L" from "
H ”.

The CPU 9 sets the reset signal from “L” to “L”.
H ”, the CPU 9 starts up by reading the count value output from the count output CNT of the ²ⁿ counter 21 and specifying the length of time during which the power supply voltage has been reduced. It is possible to accurately determine whether or not the decrease in the value corresponds to a momentary interruption.
The reference count number serving as a reference for determining whether or not 9 is an instantaneous interruption can be easily changed by setting a processing program or the like that defines the operation of the CPU 9.

Thereafter, 2ⁿIssue of carry by counter 21
Raw or CPU 9 controlling the instantaneous interruption counter 13
As a result, the instantaneous interruption detection flag shown in FIG.
Gu T _DIs reset from "H" to "L". Also,
2ⁿThe counter 21 detects the instantaneous interruption as shown in FIG.
As the output flag is reset from "H" to "L"
To stop counting.

As described above, according to the present invention,
When the power supply voltage drops, the ²ⁿ counter 21 starts counting the clock signal supplied from the RTC circuit 11, and when the power supply voltage rises again, the CPU 9 reads the count value and determines whether or not there is an instantaneous interruption. Can be determined. Thus, the instantaneous interruption can be accurately detected without depending on the circuit characteristics such as the discharge characteristics of the RC circuit. Further, the length of time (reference count number) serving as a reference when determining whether or not there is an instantaneous interruption can be easily changed by setting a processing program or the like executed by the CPU 9.

In the above embodiment, the mobile telephone device 100 has been described as an example, but the present invention is not limited to this.
That is, the present invention is applicable to any portable terminal device such as a portable optical disc reproducing device and a notebook personal computer. In this case, a drop in the power supply voltage is detected,
By counting the clock signal supplied from the circuit for measuring the time and measuring the length of time until the power supply voltage rises again, it is possible to accurately determine whether or not an instantaneous interruption has occurred.

[0079]

As described above, according to the present invention, the length of time during which the power supply voltage is reduced is measured by counting the clock signal generated by the circuit for measuring the time, and the time is accurately measured. The operation can be controlled by detecting an instantaneous interruption. In addition, the setting of the processing program makes it possible to easily change the instantaneous interruption detection period, which is a reference when detecting an instantaneous interruption.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a mobile telephone device as an example of a portable terminal device to which an instantaneous interruption control device according to an embodiment of the present invention is applied.

FIG. 2 is a diagram showing a configuration of an instantaneous interruption counter.

FIG. 3 is a timing chart for explaining the operation of the mobile telephone device.

FIG. 4 is a diagram showing a configuration of a circuit that can be considered as a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 RF signal transmission / reception circuit 3 baseband signal processing circuit 4 ROM 5 RAM 6 input key 7 display 8 audio codec 9 CPU 10 clock control circuit 11 RTC circuit 12 power control circuit 13 instantaneous interruption counter 14 voltage monitoring circuit 15 power supply Circuit 16 Battery for main power supply 17 Battery for backup 100 Mobile telephone device 200 Power supply control circuit C100 Capacitor G100 Gate K100 Voltage comparison circuit R100, R110, R111 Resistance

Claims (13)

[Claims] A power supply including a battery; a clock means for measuring a current time; a count means for counting a clock signal supplied from the clock means; and detecting a decrease in a voltage value output from the power supply. A momentary interruption control device, comprising: count control means for causing the counting means to start a counting operation; and processing means for executing processing based on the count value of the counting means. 2. The count control means determines whether a voltage value output from the power supply is less than a predetermined reference value.
The instantaneous interruption control device according to claim 1, wherein when it is determined that the count value is less than the reference value, the counting means starts the counting operation. 3. The count control means determines whether a voltage value output from the power supply is less than a predetermined reference value.
Voltage monitoring means for generating a voltage monitoring signal indicating a determination result, and operation control means for controlling start and stop of the counting means and the processing means according to the voltage monitoring signal generated by the voltage monitoring means. The instantaneous interruption control device according to claim 1 or 2, wherein: 4. The operation control means generates a voltage drop detection signal according to a voltage monitoring signal, and the counting means starts counting operation according to the voltage drop detection signal generated by the operation control means. The instantaneous interruption control device according to claim 3, characterized in that: 5. A count setting means for setting an instantaneous interruption detection flag in accordance with a voltage drop detection signal generated by said operation control means, and when an instantaneous interruption detection flag is set by said flag setting means, Carry-count means for starting counting of a clock signal supplied from the time-measuring means, and generating a carry signal indicating whether or not clock signals of a number corresponding to a predetermined number of digits have been counted; and 5. The apparatus according to claim 4, wherein the means resets an instantaneous interruption detection flag when the carry signal generated by the carry counting means indicates that a predetermined number of clock signals have been counted. Instantaneous interruption control device. 6. The power supply, comprising: a main power supply battery for supplying electric power when the processing means executes processing; and a timer when the voltage value output by the main power supply battery decreases. The instantaneous interruption control device according to any one of claims 1 to 5, further comprising a backup power supply battery that supplies power to the count unit and the count control unit. 7. Recording means for recording a processing program, processing means for executing processing according to the processing program recorded in the recording means, a power supply including a battery, and a clock signal for generating a current time Time measuring means for measuring the voltage, voltage drop detecting means for detecting whether a voltage value supplied from the power supply is less than a predetermined reference value, and a voltage value supplied from the power supply being less than the reference value. Counting means for counting a clock signal generated by the time measuring means when the voltage drop detecting means detects the voltage drop, When the voltage drop detecting means detects, by specifying the number of clock signals counted by the counting means, whether the drop in the voltage value supplied from the power supply is instantaneous interruption Or determined, the determination result switches the operation in accordance with, the portable terminal apparatus characterized by. 8. The apparatus according to claim 7, wherein said processing means executes a recovery process from the instantaneous interruption when determining that the decrease in the voltage value supplied from said power supply is an instantaneous interruption. Mobile terminal device. 9. The power supply according to claim 7, wherein when the processing unit determines that the decrease in the value of the voltage supplied from the power supply is not an instantaneous interruption, the power supply is turned off to stop the supply of power. 9. The mobile terminal device according to 8. 10. The processing means determines whether the number of clock signals counted by the counting means is less than a predetermined reference count, thereby reducing a decrease in a voltage value supplied from the power supply. The portable terminal device according to claim 7, wherein it is determined whether or not there is a momentary interruption. 11. The portable terminal device according to claim 7, wherein the processing unit includes a wireless communication unit that performs communication by transmitting and receiving a wireless signal. 12. A clock signal generated for measuring a current time is counted by determining whether or not a voltage value supplied from a power supply is less than a reference value. When the voltage value supplied from the power supply returns to the reference value or more, by specifying the number of counted clock signals, it is determined whether the decrease in the voltage value supplied from the power supply corresponds to an instantaneous interruption, An instantaneous interruption control method, wherein an operation is switched according to a result of the determination. 13. A method of determining whether the number of specified clock signals is less than a predetermined reference count number to determine whether a decrease in the voltage supplied from the power supply corresponds to an instantaneous interruption. The instantaneous interruption control method according to claim 12, wherein