TWI328156B - Portable device with real time clock and reset circuit - Google Patents

Description

IX. INSTRUCTIONS: TECHNICAL FIELD OF THE INVENTION The present invention relates to a hand-held device for a handheld device clock and reset circuit. [Prior Art] Set inside 3 2; = system, hand-held device' its system or equipment

Including - 日 日# _ Φ nal C°mputer, PC) motherboard package, ..: road, which is the basis for calculating the time of the computer system. When the brain is shut down, the battery from the motherboard will be supplied with power to the RTC, :;

= True record time 'The system will not reset the system every time it is rebooted. (4) Preset time, causing the sleepy I. The transmission mode of the RTC is mostly transmitted by the i2C (theinteric) mode. "Only two transmission channels are required." , sequence data line (SeHal to 匕 ^ 1

In particular, there is an instant ^^^(Serial C1〇ckLlne, the serial clock line is used to transmit the clock and the sequence data pin is used to transmit or receive data. The time when the U-gate transmission is connected to the RTC is the system time, so it is accurate. Degree is a necessary consideration. General = words 'Because the system or device with RTC circuit usually has a self-power supply, when the (4) is not turned on, the RTC can also correctly count when the system performs a reset action or restarts the system. It does not change the RTC time of the system. Only when the system or device loses power to reset its RTC time. 4 However, 'previous technology exists—the problem has plagued us for a long time. 5 1328156 If the CPU The reset action cannot occur at the same time as the internal processor t rtc, so it is easy to cause the handheld system to malfunction. For example, refer to the first figure, which shows the central processing unit (CPU) applied to the handheld device. 11 〇 and power management unit (p. (4) Manage_

1^, _) 120, wherein the central processing unit 11 包含 includes a circuit of instant time $ (RTC) for setting the time inside the system. The power management unit 120 consumes a central processing unit (CPU). UG to provide the power required by the unit 110. The D16 (GPI〇3〇), R8 (Gpi〇9), and w 15 (Gm4G) pins of the central processing unit 110 are general-purpose input (Gpi〇) pins. It can be accessed or controlled by a public peripheral bus (publie peHpheral _). The IM6 pin is connected to the output pin 34 of the power management unit i2() via the resistor R393 (nPW should be L). This pin 34 is an open-drain output (Open-Drain 0utput). Vb Ατ ) When the battery is too low or due to overheating, the system _ (Shutd〇wn) or when the battery cover is removed. Then this pin is set to a low level. The pin R8 of the central processing unit 110 is connected to the pin 35 (nINT) of the power management unit 12, and the power management unit 12 〇 output pin 35 functions to indicate a charging fault (ChargeFault) < terminate, or when the output is lower than one At lower tolerances, it will be activated to a lower level. W15 is connected to the end of the power switch S17 and a resistance of 4·7Κ, and the end of the power switch si7 is connected to the battery (VB AT). The pin 32 (nMPU-RESET) of the power management unit 12G is an open-pole reset output terminal, and is connected to the pin (10) 6 1328156 3 ( GND ) of the central processing unit to be connected to the ground line; pin 4 (NC ) is empty and no components are connected. Pin! For the low level (Active L〇w) reset signal output, it is connected to the pin Ri2 of the central processing unit 11〇. The main function of the delay circuit 130 is the delay time. When the battery of the handheld device (VBAT) is placed on the handheld device for the first time, the pin i of the delay circuit 130 is automatically delayed by about 2 seconds, and then the pin is further A reset signal is output to the central processing unit 11A.

If the delay circuit 130 is delayed (automatic delay is about 2 seconds), the user presses the power switch key of S17, and the pin 3 3 end of the power management unit 12 also sends a simultaneous transmission. K唬 to the pin Y12 end of the + central processing unit 110, because the power supply of the middle and the virtual processing of the early stage is provided by the power supply system as early as 120, so the wheat field is processed by the tiantian 110 Ji Baozhen, the reset of the output of the delay circuit 130 is made early, until 1琉 has been lost, meaning that the medium 110 does not detect the reset signal. Proper operation = easy to cause the central processing unit m method must first remove the handcuffs ★ drive ..., indeed start. In general, it is necessary to remove the battery of the handheld device, reset it, and then try to re-open the handcuffs + # "Battery to the handheld device. However, the above circuit configuration often causes inconvenience to the user: "In order to solve the aforementioned problems, the handheld device of the main clock and the reset circuit of the present invention* includes: a type having a real-time unit, and an internal With - instant clock, this = one. The logic in the handheld device at the center and the processing of it, used to _ ^ power government unit, 8 丄 light in the middle of the reference γφ g should be. A power gate A power supply switch for managing the handheld device, one end of which is connected to the battery and the other end is connected to the n-unit, and the reset is electrically connected to the central reset circuit to generate a first reset signal. When placing this hand-held penetrating, the central 4 gas is installed and the power is turned on.

And receiving the second weight from the power management unit, setting Q to perform a reset action, and clearing the internal 7< During the switch, the central processing single f reset operation, and the power is turned back on. The T-day processing is only from the power management number, and the 4$ first reset signal circuit in the central processing unit includes a reset operation. The reciprocal circuit is used to lock the dry-out circuit of the flip-flop circuit, and the reverse circuit is lightly coupled to the aforementioned It output in the flip-flop circuit and the neutral circuit. Or circuit, light (or) logic. Worth, the main 70 SM to provide the Boolean algebra - the reset end = the central processing unit includes the third set of knowledge points, the straw to reset the central end of the estimate, the first input is connected to the first 2 or idle circuit - two reset the endpoint, thereby resetting the two; single and: _ rational unit includes the following: the output of the circuit is connected to the first weight: end: % clock. The time is determined by the instant clock and reset of the two-T technology before the normal boot, handheld; the central processing unit is not input can be set and the asynchronous reset signal is activated when the next time is turned on. . And after the device 9 is hoisted and turned on, when the sergeant pq is set to open the system, the central processing unit simply covers the 俾: set the time of the instant clock to ensure that the ruler is (real) positive (four) start system, and can Ensure the correct RTC time. It should be understood. The purely preferred embodiment and the accompanying drawings are detailed below, which is used in the context of the preferred embodiment only. Furthermore, the invention may be applied to other Φ. The invention is limited to any embodiment and should be based on the scope of the application and its equivalent fields.佳实 = "Preferred embodiment" in this patent specification means to describe a particular feature, structure or characteristic with respect to the implementation: in the present invention, it is preferably = Γ, to t is one. Therefore, the present specification "the preferred embodiment of the present invention iU4 1 is not referred to the same as the embodiment. Furthermore, the special features, the structure can be mixed in the preferred embodiment using any suitable method. According to a preferred embodiment of the present invention, the vehicle name I is in accordance with the preferred embodiment of the present invention, and the present invention has an internal clock (not shown: the central processing unit 21 is used to determine the handheld The device 1 is configured to process its program; a memory unit 24 is coupled to the central processing unit = 210' to store the data content of the handheld device 200; a pass: group one 250, coupled to the central processing The unit 21A is configured to communicate information to the external power supply unit 220, and provides and manages the hand through the battery 260. The power supply of the device 200 is controlled by the power management unit 22, and the processing unit is π 210; The reset circuit 230 is connected to the central processing 1328) 56 to reset the circuit 23 to generate a first reset signal. According to the second figure, one of the circuits is configured according to the inventive concept. To illustrate the innovative instant clock of the present invention (rt c) 】 The circuit 'according to the preferred embodiment of the present invention, can be applied to:; has a PU in the hand-held communication system. Power switch Chuan, ^ also knows to connect its power management unit 220 盥 central processing ... 10 when the battery ( Not shown)

Set and 'turn on the power switch S18, its central processing unit t ^ (4) reset circuit coffee to receive the first - reset signal and from the power management early 2G first reset signal 'the internal processing unit 210 inside A reset action 'clears and clears the instant clock of the central processing unit 21〇. When the central processing unit 210 P acts and restarts the power switch S18, the central processing unit 21 receives the second reset signal sent by the power management unit (10), and the central processing unit performs a heavy internal The action is set, but the instant clock of the central processing unit 21 is not cleared. In the present embodiment, the reset circuit 23A includes a flip-flop circuit, a reverse circuit IV1, and a gate circuit 〇Rb reverse circuit m, the first end and the third end, and the eighth end of the flip-flop The 4th end and the 5th end and the 3rd end of the OR gate circuit (10) are respectively the power supply end and the ground end of the circuit. That is, V Mountain DD "DRTC_OMAP is marked as the power supply end of the handheld device 2" system, connected to the 5th end of the power supply terminal of the reverse circuit ινι, or the 5th end of the gate circuit 〇ri, and the power supply end of the flip-flop 8 (Vcc) and the resistor ri66. The port is required to be installed in the handheld device. The battery is not supplied from the handheld device. VDD_DRTC-OMAP continuously supplies power to the above components. 1328156 The power management unit 220 is lightly coupled to the central processing unit 21. 〇 to provide the power required for the central processing unit & 210. The D16 (GPI〇3〇), R8 (GPI〇9), P18 (GPIO03) and Wl5 (GPKMO) pins of the central processing unit 210 are general purpose input and output ( The Gpi〇) pin can be accessed or controlled by a PubUe Peripherai Bus. The pin is connected to the output pin 34 (nPWRFAIL) of the power management unit 22 via a resistor R393, and the pin 34 is open and Extreme output

Output)' When the battery level of the handheld device is too low, or the system is about to shut down (Shutdown) or remove the cover of the battery 2〇6 due to overheating, the pin is actuated to a low level. Pin R8 is connected to pin 35 (nINT) of power management unit 22A. The power management unit 220 output pin 35 acts to indicate a charge fault or termination, or to operate to a low level of potential when the output is below a lower allowable amount. Connect _P18 to the input terminal 2 of the reverse circuit W. Connect to the end point 2 of the power switch (10) and a resistor whose Φ terminal 1 is connected to the battery. Tg 220 32 ( nMPU_RESET) ^ and the pole reset output, connected to the pin (10) of the central processing unit 21 (nMPU-RESET). The pin U2 receives the asynchronous input signal outputted from the pin 32 terminal of the power management unit, and the central processing unit 210 generates a corresponding action. The pin T20 (L0W-PWR) end is the low power demand output end of the central processing unit (L〇W-power Request 〇utput), indicating that the central processing unit 2U) is in the low power sleep mode 4, and the central processing unit a 2i〇 The pin 12 1328156 =0 receives the signal of the power supply, the pin 36 (L〇w_p〇wER) of the management unit 220, and then causes the central processing unit 210 to enter the sleep mode. The pin 47 of the power management unit 220 (PB〇n-〇ff) is connected to the terminal 2 of the power switch S18. When the power switch S18 turns on the trigger pin, the power supply unit 220 is turned on from the low power mode. /Pump 33 of the power management unit 22() (nREspwR〇N) is the open-circuit system reset output, connected to the second reset terminal of the central processing unit 21 (pin γ12 (0N/0FF) The second reset terminal (pin γΐ2) is a low level asynchronous reset signal input terminal (ASynchronous Reset), when the central processing unit 210 receives the reset signal from the pin of the power management unit 22, then Reset all internal states of the central processing unit 21; but it does not clear the internal rt c time of the central processing unit 2. The pin R12 (nRESPWR〇N) of the central processing unit 210 is the second reset terminal. The second reset terminal (R12) is the reset input of the central processing unit 2 ι. When the R12 of the central processing unit 210 receives the reset signal from the output of the reset circuit 230, the central processing unit 21 is not only Resetting all internal states will also clear the RTC time inside the central processing unit 2 1 . The battery 260 of the handheld device 200 (not shown in the third figure) is placed in the battery holder in the handheld device for the first time. , VDD supply power maintains a preset potential Then R166 and C370 form a resistor/capacitor (RC) charge and discharge circuit. Therefore, the flip-flop circuit 6 (CLR) of the flip-flop circuit 24 will maintain a low level (Low) pulse input from its pin 6 to the front and back. In the device, it is cleared to the pin 5 (Q) state of the previous flip-flop circuit 232, and is set to low level 13 1328156

The V bit (the data input terminal 2 (D) of the flip-flop circuit 232 is grounded to the clock input terminal 1 (CLK), so it is not necessary to consider). When the output pin 5 of the flip-flop circuit 232 is at a low level, the pin 2 connected to the OR circuit 〇R j by its pin 5 is also at a low level. Furthermore, when the pin 2 of the OR circuit R1 is at a low level, the state of the output pin 4 of the gate circuit R1 is determined according to the state of the pin 1 of the gate circuit OR1.

The battery 260 of the field handheld device 200 is first placed in the battery holder of the handheld device 200, and the pin Ri2 of the central processing unit 21 must be simultaneously output by the reset circuit 230 and the power management system 22. Second, the reset signal is reset. At this time, the power management system sends the first reset k number to the pin γη of the central processing unit by the pin 33, the middle=processing unit 2H) (4) performs a reset operation, and clears the central processing unit. When < (RTC) ' @ when the towel processing unit 210 has completed the reset action ' and re-turns on the power switch si8, the central processing unit 2H) receives the second only from the power management unit 22 The reset signal, the central processing unit .21, only performs a reset action internally, without clearing the instant clock (rtc) of the central processing unit 21G. a Therefore, the present invention is designed to solve the problems caused by the prior art, and the central processing unit is not activated by the second and the Y2, and after the system is turned on, the next time the system is turned on, The central processing unit simply resets the system, does not reset its RTC time, ensures that its hop time is not covered, has reached the normal opening system, and can correctly use the time. It is to be understood that the invention is not limited to the spirit of the invention. Modifications and similar configurations made by In _, without departing from the spirit of the invention, are intended to be included in the following claims, and all such modifications and similar structures should be covered and the broadest interpretation. For example, the central processing unit, power management unit, and flip-flop circuit referred to in the present invention are as described above with preferred examples, but other alternative names are possible. Furthermore, the elements of the same function can be used for a long time.

The above-mentioned and its implementation of money (4) exposes other changes and modifications, and does not recite the scope and spirit of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS In order to provide a more complete understanding of the present invention and its advantages, the same reference numerals are used to refer to the accompanying drawings, wherein the same numerals represent the same (four), and particularly the first figure is based on prior art heavy UTC) circuits. Reset (heart (10)) with instant clock

The second figure is an architectural diagram of a preferred embodiment of the apparatus in accordance with the present invention. The present invention is a circuit diagram of a preferred embodiment of the present invention in accordance with the present invention. Instant clock and reset power of the embodiment [Main component symbol description] 110 central processing unit 120 power management unit 130 delay circuit 200 handheld device 210 central processing unit 1328156 220 power management unit 230 reset circuit 232 flip-flop circuit 240 memory Body unit 250 communication module 260 battery

Claims (1)

1328156 Ten patent applications: a hand-held device, including: battery; - central processing unit, with an instant when the internal === logic and processing in the handheld device;:: processing single power: two: early 疋 'through The battery provides and manages the power supply of the handheld device, the power management unit is lightly traced, and the central processing unit is turned off; the original switch is connected to the battery management unit at one end; The terminal is connected to the power supply 70 and the central processing unit, and a reset circuit is connected to the middle generation-first reset signal: the central processing is early; the reset circuit is in which the battery is just placed When the hand is off, the middle 奂; _ and the power supply is turned on (4) and Λ _ receiving the first reset 自 from the heavy Μ 仏遽 and from the power management single domain receiving - the central processing unit performs a Set 4, the instant clock of the _ yuan; Practice 'Delete the central processing unit when the central processing unit has completed the reset switch, the t-process i _ # ώ re-open 泫 power supply 2 reset source management unit Receive the first . A reset operation is performed inside the central processing unit of the 亥5 hai. 2. The circuit of claim 301 includes: a hand-held device, wherein said resetting a flip-flop circuit for outputting the state of the -#-reverse circuit two-circuit circuit; &amp; A signal inverted from the flip-flop circuit 91 is output to the flip-flop circuit, and 17 or a gate circuit 'accommodates between the forward-reverse circuit and the central processing unit to provide Boolean algebra or logic . 3. The handheld device of claim 19, wherein the central processing unit includes a first reset endpoint and a second reset endpoint, the first reset endpoint receiving the first-i The team leader resets the signal, and the second reset terminal receives the second reset signal. 4. The handheld device of claim 3, wherein the first reset terminal is connected to the output of the OR gate circuit. 5. The hand-held device of claim 3, wherein the second reset signal is coupled to the power management unit and the reset circuit. 6. The hand-held device of claim 2, wherein a more discharge circuit is connected between the flip-flop circuit and the inverter circuit, wherein: When the central = early read and receive 4th - reset signal, the central processing Qiu performs a reset action, and clears the instant clock of the central 兀内#丹慝理兀. 8. The hand-held device of claim </ RTI> wherein the central resetting signal is received when the second reset signal is received. Dry 70 邛 邛 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 , in the early morning 兀 to store the handheld 10. As claimed in the patent scope! The hand-held video module of the item is lightly coupled to the central office. The use of ^ further includes - communication information to the outside. A hand-held device comprising: - a central processing unit having an instant clock inside - a power management unit, a power supply; an early 70-way arbitrage reset circuit coupled to the central unit in a first- At the same time, the central processing unit is re-scheduled; the central processing unit and the instant processing state are only reset to the central processing unit. 12. If the handling unit of the u-th item of the patent application scope includes the first paragraph, the meaning of the deduction, the poor - the Jinshan end point and the second reset end point 'in the first hour weight ^ The point receives the signal from the reset circuit, and the same as the first clock unit and the instant clock; in the second state, the self-power management unit receives the signal, thereby resetting the center 13. As claimed in the patent source The switch is integrated into the central holding device, wherein the electric field is further connected to the power management unit, and the power is supplied to the central processing unit and the power management unit 1328156. 14. If the patent application scope u., a ^ ^ [ 卞 式 , , , , , , , 外部 外部 外部 外部 外部 外部 外部 外部 mm mm mm mm mm mm mm mm mm mm mm mm mm mm The hand-held device of claim 12, wherein the reset circuit comprises: - a flip-flop circuit for locking an output state of the flip-flop circuit; and a reverse circuit 'face-to-distance central processing The unit and the flip-flop circuit provide a reverse k-number output to the flip-flop circuit; and or the gate circuit is adapted to provide a Boolean algebra between the flip-flop circuit and the central processing unit logic. 16. The hand-held device of claim 15 wherein one of the inputs of the OR gate circuit is coupled to the second reset terminal. 17. The hand-held device of claim 16, wherein the OR gate output is coupled to the first reset terminal. 18. The hand-held device of claim 12, wherein the reset circuit comprises a resistor/capacitor (RC) charge and discharge circuit. 20