WO2004021154A1

WO2004021154A1 - Mobile electronic device

Info

Publication number: WO2004021154A1
Application number: PCT/JP2003/010819
Authority: WO
Inventors: Yuuichi Inoue
Original assignee: Seiko Instruments Inc.
Priority date: 2002-08-27
Filing date: 2003-08-27
Publication date: 2004-03-11
Also published as: AU2003261743A1; JPWO2004021154A1

Abstract

There is provided a mobile device which can easily reset a CPU when software in operation runs away in a computer system. When a push type power switch (1) is continuously pushed for a predetermined period of time, this is detected by a continuous push detection circuit (2), which outputs to a CPU (3) a reset signal for initializing the operation of the software which has run away.

Description

Description Portable electronic equipment Technical field

The present invention relates to a method for resetting a portable electronic device, and more particularly to a method for resetting a portable electronic device having a limited structure, such as a small portable electronic device. Background art

Portable electronic devices on which the software operates, for example, portable computers such as mobile phones and PDAs' · The operating V software runs out of control and all operation buttons and keys are inoperable In some cases. In such a case, it is necessary to reset the CPU with a hardware circuit that operates according to the software and has nothing to do with the computer's system or the CPU (hereinafter referred to as hardware reset). Conventional hardware reset methods are mainly the following three: force ⁵ ', which method is a challenge? I got it.

(Method 1) Remove the battery from the portable electronic device and connect the battery to the device again.

(Method 2) Press the sinking reset switch, which is placed on the back of the operation surface, with a thin object such as a wire.

(Method 3) Press multiple push buttons on the portable electronic device at the same time.

In conventional mobile phones, there was a method of resetting the hardware by removing the battery from the device and reconnecting it. FIG. 2 is a block diagram showing a first hardware reset method of a conventional portable electronic device. User Is a structure that allows the battery to be removed from the device. When reconnecting the battery 6 to the device, the power-on reset circuit 9 detects that the power has been turned on by detecting a sudden rise in the power supply voltage. 5 operates and outputs a reset signal to the CPU 3, so that it is possible to hard reset the CPU 3 even when the software runs out of control. (Method 1)

Also, in conventional PDAs and the like, hard reset was performed by pressing a sunk type reset switch installed on the back side of the display surface or operation surface with a thin object such as a wire. FIG. 3 is a block diagram showing a second hardware reset method of a conventional portable electronic device. Since the output signal of the squat-type reset switch 15 is input to the reset terminal of the CPU 3 regardless of the operation of the software, even if the software runs away, the CP II 3 It was possible to reset the hardware. (Method 2) '' Furthermore, in digital wristwatches with a waterproof structure, hardware reset was performed by pressing all four or three push buttons simultaneously. FIG. 4 is a block diagram showing a third hardware reset method of a conventional portable electronic device. The output signals of the buttons 101, 102, and 103 are input to a chattering prevention circuit (not shown), which removes chattering that occurs when the buttons are opened and closed. Input to AND circuit 104 that detects that all three buttons are pressed. When the AND circuit 104 detects that all the buttons are pressed, it outputs a reset signal to the CPU 3, so it is possible to reset the CPU hardware even if the software runs away. Was. (Method 3) However, each of these conventional hardware reset methods has the following problems.

(Issue 1) In methods 1 and 2, it was difficult to make the portable electronic device waterproof. (Issue 2) Method 2 required special items such as wires.

(Problem 3) Method 2 and Method 3 cannot be used unless the user understands the hardware reset method.

In the case of the method of resetting the battery by removing the battery from the device (Method 1 above), it is very difficult to make the portable electronic device waterproof. When the user removes the battery from the device, the battery can be reset and the battery removal structure of the portable electronic device that can be waterproofed is very complicated and large. However, there is a problem that the weight increases and the manufacturing cost increases.

In the case of the hard reset with the sunk type reset switch (Method 2 above), it is natural that the keys and buttons on the operation surface have a waterproof structure, but they are arranged on the back of the operation surface. The sunken reset switch must also be waterproof. Since movable parts having a waterproof structure are required on each of the front and back sides of the equipment, the equipment becomes large, and the manufacturing cost increases. Also, if the software runs away and runs out of control, it will not be possible to reset the hardware immediately, because a thin object such as a wire to press the type reset switch is not always available to the user. There were also issues. In addition, since the squeezed reset switch is not frequently operated, some users may not be able to reset the hardware because they do not understand the purpose and use of the sunk reset switch. There were also issues.

As a hardware reset method that is often used in digital wristwatches with a waterproof structure, the method of resetting the hardware by simultaneously pressing all four or three push buttons (method 3 above) However, since two or more buttons are not pressed simultaneously in normal operation, the user often does not know how to reset the hardware. The user should read the first instruction manual after the problem of runaway There was a problem that the equipment could not be used during that time because it was the first time that you understood how to reset the hardware.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the related art. When software running in a computer system runs away, the CPU can be reliably reset by a simple operation. The purpose is to provide portable electronic devices.

■ Disclosure of the invention

In order to achieve the above object, the present invention incorporates a hardware reset circuit capable of resetting the CPU in a portable electronic device even when the software runs away. The hardware reset circuit is a push-type power switch.

• A configuration in which the detection circuit 2 (hereinafter referred to as the detection circuit) that detects that 1 (hereinafter referred to as the 'power switch) is kept pressed for more than a certain period of time and outputs a runaway CPU helicopter signal And ... Brief description of drawings:.

FIG. 1 is a block diagram showing a first embodiment of a portable electronic device according to the present invention.

FIG. 2 is a block diagram showing a first hardware reset method of a conventional portable electronic device.

FIG. 3 is a block diagram showing a second hardware reset method of a conventional portable electronic device.

FIG. 4 is a block diagram showing a third hardware reset method of a conventional portable electronic device.

FIG. 5 is a block diagram showing a second embodiment of the portable electronic device according to the present invention. FIG. 6 is a circuit diagram showing an embodiment of a detection circuit and a pulse generation circuit according to the present invention.

FIG. 7 is a timing chart showing the potential of each signal line of the detection circuit and the pulse generation circuit of FIG.

FIG. 8 is a circuit diagram showing an embodiment of the detection circuit according to the present invention.

FIG. 9 is a block diagram showing a third embodiment of the portable electronic device according to the present invention. .

FIG. 10 is a first example of a evening diagram showing the potential of each signal line in FIG. FIG. 11 is a second example of a timing diagram showing the potential of each signal line in FIG. FIG. 12 is a third example of a timing chart showing the potential of each signal line in FIG. FIG. 3 is a fourth example of a timing diagram showing the potential of each signal line in FIG. FIG. 14 is a cross-sectional view showing the waterproof structure of the push-type power switch according to the present invention. ''

FIG. 15 is an external view of a wristwatch-type portable electronic device according to the present invention. 'FIG. 16 is a block diagram showing an improved example of the fourth embodiment according to the present invention. FIG. 17 is a block diagram showing an embodiment of the voltage conversion circuit according to the present invention. + · Fig. 18 is the first example of the timing diagram showing the potential of each signal line in Fig. 17 Fig. 19 is the problem of the timing diagram showing the potential of each signal line in Fig. 17 Is an example

FIG. 20 is a block diagram showing a fifth embodiment of the portable electronic device according to the present invention.

FIG. 21 is an example of a timing diagram showing the potential of each signal line in FIG. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. First Embodiment A first embodiment according to the present invention will be described with reference to FIGS.

FIG. 15 is an external view of a wristwatch-type portable electronic device showing an arrangement of a display device 5 such as an LCD, a power switch 1 and an operation button 4, and the like. FIG. 1 is a block diagram showing an overall configuration of a portable electronic device driven mainly by a battery 6 (not shown) such as a secondary battery.

The CPU 3 operates according to the software stored in the memory 32, the display device 5 such as an LCD displays the display data output from the CPU 3 so that the user can see it, and the operation button 4 is used by the user. The operation is converted into an electric signal and output to the CPU 3, the battery .6 supplies power to the entire portable electronic device, and the power supply: the switch 1 opens and closes the electrical contacts, the detection circuit 2 the power switch 1- The detection circuit 2 detects whether or not is pressed for more than a certain time (t'2). When the detection circuit 2 detects that it is kept pressed for more than a certain time (t2), it initializes the software 3 + operation of the CPU 3. Output a reset signal to the CPU. :

CPU 3 that operates according to the soft duer detects whether or not the electrical contacts of power switch and switch 1 are opened and closed via the input port of CPU 3 for a certain period of time (t 1). However, if it is detected that the power switch 1 is kept pressed for a fixed period of time (t 1) while the power is on, the CPU 3 turns off the portable electronic device. The detection circuit 2 detects with a hardware circuit whether or not the button 3 has been pressed for a certain time (t 2) regardless of the CPU 3 operating according to the software. When a is detected, a reset signal for initializing the software operation of CPU 3 is output.

If the software running on CPU 3 runs away, the operation of CPU 3 to turn off the power of the portable electronic device is not guaranteed even if power switch 1 is kept pressed for a fixed period of time (t 1). Hard regardless of 3 The operation of outputting a reset signal is guaranteed if the key circuit detects and keeps pressing for a certain time (t2) or more. The magnitude relationship between the fixed time (t1) and (t2) is naturally t1 <t2. If tl> t2, the reset signal is output from the CPU 3 before the portable electronic device is turned off, even if the software-air does not run away.

Next, a second embodiment according to the present invention will be described with reference to FIGS. FIG. 5 is a block diagram showing a configuration in which an impulse generation circuit 9 is added to the block diagram of FIG.

A one-pulse generation circuit 9 is added between the detection circuit 2 and the CPU 3 to prevent the reset signal from the detection circuit 2 to the CPU 3 from being output for a long time and the CPU 3 from remaining in the reset state. did. By adding the pulse generation circuit '' 9, the reset signal does not continue to be output to 'CPU 3' for a long time, so CPU 3 starts initialization processing after reset signal release. C: Since PU3 immediately starts the initialization process, the user can immediately confirm that the portable electronic device has started to operate normally.

FIG. 6 is a circuit diagram showing an embodiment of the detection circuit 2 and the pulse generation circuit 9 according to the present invention.

When the user presses the power switch 1, the electrical contacts become conductive, and when released, the electrical contacts 11 become non-conductive. In the separated state, the electrical contact 11 is non-conductive, so that the signal line 21 is connected to the negative electrode of the battery via the resistor 12. In the pressed state, the electrical contact 11 is conducted, so that the signal line 21 is connected to the positive electrode of the battery. A resistor 24 and a capacitor 26 form an integration circuit, and the integration circuit sets the time to keep pressing power switch 1. Also, the signal line 21 is connected to the input port of the CPU 3, and the CPU 3 can check at any time whether the power switch 1 is pressed by the user. Also, an interrupt signal can be supplied to the CPU 3 when the signal line 21 rises or falls. FIG. 7 is a timing chart showing the potential of each signal line of the detection circuit and the impulse generation circuit of FIG.

The signal line 21 has the positive electrode potential of the battery when the power switch 1 is pressed and the negative electrode potential of the battery when the power switch 1 is released. When the power switch 1 is kept depressed, charges accumulate in the capacitor 26 via the resistor 24, so that the potential of the signal line 22 gradually increases as shown in FIG. When the potential of the signal line 22 exceeds the threshold voltage of the inverter 27 having a hysteresis characteristic, the potential of the signal line 23 is inverted as shown in FIG. Since the one-pulse generation circuit 9 forms a subdivided circuit by the capacitor 92 and the resistor 93, when the potential of the signal line 23 rapidly drops from a high potential to a low potential, the signal line 91 One pulse as shown in Fig. 7 is generated. This wapulse is supplied to CPU3 as a reset signal.

The operation when power switch 1 is released is as follows. When the power switch 1 is released, a current flows through the resistors 1 and 2 and the diode 25, so that the electric charge accumulated in the capacitor and the capacitor 26 is discharged. If the resistance values of the resistors 1 and 2 are set relatively small, the potential of the signal line 22 drops sharply as shown in FIG. If the potential of the signal line 22 drops sharply, the potential of the signal line 23 which is the output terminal of the inverter 27 is inverted from a low potential to a high potential. The signal line 91, which is the output terminal of the one-pulse generation circuit 9, is forced to rise to a higher potential from the state in which it has been pulled up to a higher potential by the resistor 93, and the forward voltage (Vf) of the diode 94. When the potential rises to this point, current flows into the diode 94, so that the potential does not rise above V f as shown in FIG. ·

The operation of the circuit example in which the hardware reset is performed on the CPU 3 when the power switch 1 is kept pressed regardless of the software operating on the CPU 3 has been described with reference to FIGS. 6 and 7. The circuit example in Fig. 6 can achieve low power consumption because there is no circuit that always operates, such as an oscillation circuit. However, since the integration circuit and the differentiation circuit are composed of resistors and capacitors, capacitor It is necessary to arrange a plurality of electronic components, such as a sensor. Therefore, a circuit example using a counter and an oscillation circuit without using electronic components such as capacitors is shown in the figure.

Figure 8 If circuits such as counters are integrated on the same chip as the CPU, it can be realized without increasing the mounting area on the board.

The operation of FIG. 8 will be described briefly.

The oscillation circuit 28 always oscillates regardless of the software operation of the CPU 3 and always supplies the clock to the counter 29. When the power switch 1 is not pressed, the counter 29 does not count because the output signal 16 of the inverter 15 always resets the counter 29. Therefore, the counter output signal 30 does not output the reset signal 30 to CPU3. On the other hand, when the power switch 1 is pressed, the counter 29 starts counting because the output signal 16 of the inverter 15 does not reset the power counter 29. After a certain period of time, the counter output signal 30 outputs a reset signal 30 to CPU 3, and CPU is reset by hardware. .

Next, a third embodiment of the present invention will be described with reference to FIGS. -A fourth embodiment according to the present invention will be described with reference to FIGS. 16 and 17-. FIG. 16 is a block diagram showing the overall configuration of the portable electronic device, which is an application example of the first embodiment shown in FIG. In the first embodiment, the reset signal was output only to the CPU 3, but in the embodiment of FIG. 16, the reset signal was output to the memory 3 2 and the display device 5 in addition to the CPU 3, and the system was reset. Has been reset more reliably. Also, when outputting reset signals to multiple IC chips such as a CPU and a memory, the voltage level of the reset signal to be supplied may be different due to different power supply voltages of the IC chips. 'The voltage conversion circuit 55 in FIG. 16 converts the reset signal output from the detection circuit 2 into two different voltages and supplies them to the CPU 3, the display device 5, and the memory 32. FIG. 17 is a block diagram showing an embodiment of the voltage conversion circuit 55 according to the present invention. This is an example in which two power supplies having different potentials of Va and Vb are used on the plus potential side with the minus potential side being a common power supply (ground) for each IC chip. Also, this is an example where the reset input terminal of each IC chip is reset when a negative potential is supplied, and is in a non-reset state when a positive potential is supplied. The buffer 271, which has a hysteresis characteristic, is a buffer for changing a gradual rise or fall of the potential of the signal line 22 into a steep potential change at a certain potential level as a boundary.

When the electrical contact 11 of the power switch 1 is off, the open drain transistor 273 is off, so the reset signals 555, 555 supplied to each IC chip are pulled up by a pull-up resistor, respectively. It is connected to the positive potential side of the power supply (V a and V b) having different potentials depending on 55 2 and 55 3. .

The direction of the diode 551 and the connection of the 'drain terminal of the open drain transistor 273 are determined by the potentials of Va and Vb. In other words, when the open drain transistor 2 73 is off, no current flows between the power supply V a 'and V b via the bull-up resistor 5 52, 5' 5 3 and the diode 5 51 Determine the direction of the diode. For example, the example of FIG. 17 shows a case where the Va potential is higher than the Vb potential (Va> Vb).

When the open drain transistor 273 is off, the reset signals 554 and 555 are added to the power sources (V a and V b) having different potentials by the pull-up resistors 555 and 553, respectively. Holds potential. Therefore, when the open-drain transistor 273 is off, the reset signal 555 has the Vb potential, so the Vb potential is supplied to the reset terminal of the CPU 3, and the CPU 3 is in the normal state, that is, the non-reset state. Become. Further, since the reset signal 554 has the potential Va, the potential Va is supplied to the reset terminal of the display device 5 and the reset terminal of the memory 32, and each of them becomes a normal state, that is, a non-reset state. On the other hand, when the open drain transistor 273 is turned on, the drain terminal of the transistor is connected to the negative potential (ground), so that a current flows through the resistor 552 and the reset signal 554 becomes the negative potential (ground). It becomes. Also, current flows through the diode 55 1 and the resistor 55 3, and the reset signal 55 5 also has a negative potential (ground).

FIG. 18 is a timing chart showing the potential of each signal line in FIG. Similarly to the timing diagram of FIG. 7, the signal line 21 has a positive potential of the battery when the power switch 1 is pressed, and a negative potential when the power switch 1 is released. When the power switch 1 is kept pressed, the electric charge is gradually accumulated in the capacitor 26 via the resistor 24, so that the potential of the signal line 22 gradually increases. When the potential of the signal line 2 exceeds the threshold voltage of the buffer 271, which has hysteresis characteristics, the potential of the signal line 272 changes from the negative potential side (ground) to the plus potential side. Then, the open-drain transistor 2 7.3 changes sharply from off to on. '

As shown in the block diagram of Figure 17, when supplying reset signals to multiple IC chips such as CPU 3, display device 5 and memory 32, open-transistor transistor 27 3 turns off to on. It is important to make a rapid change b. To explain the reason, use Fig. 17 and Fig. 19 to explain the problem when the open drain transistor 273 changes slowly from off to on. The points will be described. In the block diagram of FIG. 17, assuming that there is no buffer 271 having a hysteresis characteristic, the operation is as shown in a timing diagram of FIG. · When the potential of the signal line 22 gradually increases, the open drain transistor 273 gradually turns on from completely off, and current starts to flow through the pull-up resistor 552. As the current flows through the resistor 552, the potential of the signal line 554 starts to gradually decrease from Va, as shown by the timing 55a in FIG. When the potential of the signal line 554 further decreases, current also starts flowing through the pull-up resistor 553 and the diode 551. As current flows through the resistor 553 and the diode 551, the tie of 55b in Fig. 19 As shown in the timing chart, the potential of the signal line 555 starts to gradually decrease from Vb. Here, assuming that the potential at which the input circuit of the reset terminal of the CPU 3 reacts is V301 and the potential at which the input circuit of the reset terminal of the display device 5 and the memory 32 reacts is V501, the signal line The signal 301, the signal line 501, and the signal line 321 are valid at timings 55c and 55d shown in the timing chart of FIG. 19, respectively. The period from 55c to 55d is defined as tLCD0ff. During the period of tLCD0ff, the display device 5 and the memory 32 are reset, and the CPU 3 is not reset. If the power switch 1 changes from the on-state to the off-state in such a state, only a part of the system is reset, which causes inconvenience. For example, when the power switch 1 changes from ON to OFF at the timing 55e in FIG. 19, the signals 501 and 321 of the reset terminals of the display device 5 and the memory 32 are output as shown in FIG. However, the signal 301 of the reset terminal of the CPU 3 is not output.

As it is not generated above problems, using a buffer 271 having a hysteresis characteristic, an open drain transistor 273 is标成to vary steeply ₀ '■' -. In FIG. 1 7, power Suitsuchi 1 When the power switch 1 is released, the charge accumulated in the capacitor 26 is discharged, the potential of the signal line 22 drops relatively steeply, and the open drain transistor 273 is released. Changes sharply from on to off. Since the open drain transistor .273 is turned off, the reset signals 554 and 555 are connected to the power sources Va and Vb having different potentials by the pull-up resistors 552 and 553, respectively, and the reset state is released.

Next, a fourth embodiment according to the present invention will be described with reference to FIGS. FIG. 9 is a diagram for explaining the operation of the power supply control circuit 8 by the power switch 1 and the operation of the detection circuit 2 by the power switch 1. The output signal 17 of the power switch 1 is connected to the detection circuit 2 and the 〇R circuit 7, and when the power switch 1 is pressed, the output signal 17 outputs a high potential (logic 1). 0 Output signal 31 controlled by the software of CPU 3 is connected to another input terminal of R circuit 7, and 0 R circuit 7 outputs output signal 7 when any one input is processing 1. 1 to turn on the power supply control circuit 8. C When the power supply control circuit 8 is turned on, the output signal 81 is output and the CPU 3 operates. When the detection circuit 2 detects that the power switch 1 has been pressed for a certain period of time (t2) or more, the detection circuit 2 outputs a reset signal 18 to the CPU, which is an output signal thereof, and initializes the CPU 3. I do.

The operation when the power switch 1 is pressed with the power of the portable electronic device turned off and released before a certain time (t1on) elapses will be described with reference to FIG. ''.

If the power switch 1 is pressed while the power is off, 0 one input of the R circuit 7 becomes logic 1. The power control circuit 8 is turned on immediately and the CPU 3 starts operating. The CPU 3 starts counting for a certain time (tlon) from the start of operation by a soft tuner. If the power switch 1 is released before the CPU 3 completes the counting for a certain time (t 1 0 η ')', both inputs of the 0 R circuit 7 become logic 0, and the power control circuit 8 immediately The power is turned off, the power supply to CPU 3 is cut off, and the operation stops.

: The operation when the power switch 1 is pressed while the power of the portable electronic device is off and released after a certain time (tlon) has been described with reference to Fig. 11. -.

When the power switch 1 is pressed while the power is off, one input of the OR circuit 7 becomes logic 1, the power control circuit 8 is immediately turned on and the CPU 3 starts operating. The CPU 3 starts counting for a certain time (t10n) from the start of the operation by software. When CPU 3 completes counting for a certain time (t I on), Changes the output signal .31 from the logic 0 to 1 controlled by the software 3 of the CPU 3. After that, even if the power switch 1 is released, the output signal 31 is at logic 1, so that the power supply control circuit 8 does not turn off the power and the power supply to the CPU 3 is not interrupted, so that the CPU 3 continues to operate.

The operation when the power switch 1 is pressed while the power of the portable electronic device is turned on and released after a certain time (t 1) will be described with reference to FIGS. If the power switch 1 is pressed while the power is on, the CPU 3 starts counting software for a certain time (tί) after the power switch 1 is pressed. When the CPU 3 completes counting for a predetermined time (t 1), the output signal 31 controlled by the software of the CPU 3 is changed from logic 1 to 0. Thereafter, when the power switch .1 is released, both inputs of the 0 R circuit 7 become logic 0, the power control circuit 8 is immediately turned off, the power supply to the CPU 3 is cut off, and the operation is stopped. -Using Fig. 13, the operation when the power switch 1 is pressed while the software of the portable electronic device runs away and released after a certain time (t2) has elapsed. · '

If the power switch 1 is pressed while the power switch is on and the CPU 3 runs out of control, the software cannot count a certain time (t1) after the power switch 1 is pressed. When detecting that the detection circuit 2 is pressed for more than a fixed time (t 2), it outputs a reset signal 18 as an output signal thereof, and initializes the CPU 3. -

There are two types of CPU 3 initialization processing. Hardware initialization and software-air initialization. When the CPU receives the reset signal 18, the CPU first initializes the hardware and then initializes the software. The content of hardware initialization differs depending on the CPU and its output port. However, no matter what state the output signal 31 is set by the initial window initialization, There is no problem if the output signal 31 is surely changed to logic 0 in software initialization. When the power switch 1 is released after the reset signal 18 is output for a fixed time (t2), the reset signal 18 is released and the power control circuit 8 is turned off.

· For the user, the power-off operation in Fig. 12 and the reset operation in Fig. 13 are almost the same. The user is pressing the power switch 1. The only difference between (t1) and (t2) is the fixed time. Then, the fixed time (t 1) and (t 2) may be set at the time of designing the device according to the method of carrying the portable electronic device and the purpose of use. There is no particular need for the user to be able to change the time (t 1) and the time (t 2). .

For example, a mobile phone: How is the power on in a normal standby state, sometimes turning off the power when getting on a crowded train, etc. In the case of a lid-like or '' -like shape that can be pushed, for a certain period of time · (t10n) and. (T1) for a certain period of time, .. 3 seconds, for a certain period of time (t2) Set it to 4 seconds or more and 6 seconds or less.

In the above example, the fixed time (t2) was set to 4 seconds or more and 6 seconds or less.This is because the integration circuit of the detection circuit 2 is composed of a resistor and a capacitor as shown in Fig. 6, This is because it is assumed that the capacitance value varies. Of course, if the detection circuit 2 is composed of a high-precision oscillation circuit 28 and a counter 29 as shown in Fig. 8, it is possible to set the fixed time (t2) to almost exactly 4 seconds. is there.

As another example, in the case of a device such as a PDA with a lid that normally closes the lid and the power is off, and occasionally removes the lid from the ball and opens the lid to turn on the power, use the lid. If you close it, there is no possibility of accidentally pressing the power switch, and you want to turn on the power immediately after opening the lid, so you can use a fixed time (t10n) for a short time, for example, 0. 1 second, Set the fixed time (t 1) to a relatively short time, for example, 1 second, and the fixed time (t 2) to 2 seconds or more.

As another example, consider a wristwatch-type mobile phone, etc., which is usually in a standby state where the power is turned on, sometimes turned off when getting on a crowded train, etc. Depending on the arrangement and structure, if it is unlikely that the power switch will be accidentally pressed for a short period of time, set the fixed time (t10n) and (t1) to a relatively long time, for example, 2 seconds, a fixed time ( Set t 2) to 3 seconds or more.

In either case, the user turns off the portable electronic device by the normal operation of holding down the power switch 1 for 1 to 3 seconds. And if there is a natural idea of turning off the power of the portable electronic device whenever you feel that the operation is abnormal due to the software runaway that occurs infrequently, Even if you do not have the specialized knowledge that you need to reset the software especially when the software runs away, you can turn off the power switch from 2 seconds with the intention of performing the normal operation of turning off the power. By holding down the switch for more than 4 seconds, the reset operation can be performed naturally. · *.

FIG. 14 is a cross-sectional view showing the waterproof structure of the power switch 1. As shown in FIG. .

A circular hole is made in the waterproof case 110, and the switch movable part 111 with the packing 111 mounted is attached to the waterproof case 110. At the end of the switch movable part 1 1 1 there is a groove 1 13 and a pawl 1 1 4. The pawl Γ 14 has a spring property due to the groove 1 13, and the pawl 114 is not caught by the case 110 so as not to come off.

The poly dome 115 is located between the tip of the switch movable part 111 and the flexible board 116, and pushes up the switch movable part 111. When the user depresses the switch movable part 1 1 1, the poly dome 1 15 is crushed, and the electrical contact between the poly dome 1 15 and the flexible substrate 1 16 is conducted. Ma When the user removes his / her finger from the switch movable portion 111, the poly dome 115 returns to its original dome shape, and the electrical contacts become non-conductive.

Next, a fifth embodiment according to the present invention will be described with reference to FIG.

FIG. 20 shows an example in which a part of the embodiment shown in FIG. 9 is modified. The functions and operations of the power switch 1, the detection circuit 2, the OR circuit 7, the power control circuit 8, and the CPU 3 are the same as those of the embodiment shown in FIG.

Using FIG. 10, the operation when the power switch 1 is pressed in the embodiment of FIG. 9 in the power-off state of the portable electronic device and is released before a certain time (t 10 n) elapses. The same operation is performed in the embodiment shown in FIG.

Using FIG. 11, the operation when the power switch of the portable electronic device in the embodiment of FIG. 9 is turned off and the power is released for a certain period of time (t 1 on) in the embodiment of FIG. However, the same operation is also performed in the embodiment of FIG. '

'' Using Fig. 12 and Fig. 9, the operation when the power switch 1 is pressed while the portable electronic device is powered on in the embodiment of Fig. 9 and released after a certain time (t1) has elapsed. As described above, the same operation is performed in the embodiment of FIG.

The operation when the power switch 1 is pressed while the software of the portable electronic device is out of control and released after a certain time (t 2) will be described with reference to FIG.

Even if the power switch is pressed for 1 second for a while and the CPU is running out of control, the software cannot count the fixed time (t1) after the power switch 1 is pressed. When detecting that the detection circuit 2 is kept pressed for a fixed time (t 2) or more, it outputs a signal 18 as an output signal thereof and turns on the open drain transistor 273. When the open drain transistor 27 3 is turned on, a current flows through the resistor 72 and the signal line 73 indicates a potential on the negative potential side (ground), the power supply control circuit 8 is turned off, and the potential of the output terminal 81 is reduced. descend. When the voltage detection circuit 82 monitoring the potential of the output terminal 81 detects a potential drop, it outputs a signal line 84 to initialize the CPU 3. Industrial applicability

As described above, according to the present invention, even if the software operated by the waterproof portable electronic device runs away and all the operation buttons and keys become inoperable, the device can be operated from the device. There is no need to remove the battery, so there is no need for the user to have a structure in which the battery can be removed and waterproofed _(and since the hardware is reset by holding down the push-type power switch, it is not necessary to remove the battery). No special items such as wires are required.Moreover, since the operation of turning the power on and off, which is usually used by the user, is very similar to the operation of the hardware reset, the user can operate the hardware reset There is no need to learn the software. Even if there is no software runaway or no specialized knowledge such as hardware reset, the software does not work. Therefore, the hardware can be reset by a very natural operation of turning off the power once.

Claims

The scope of the claims

1. In a portable electronic device including a CPU that operates according to software, a push-type switch provided in the portable electronic device must be pressed and held for a predetermined time (t 2) or more. A portable electronic device having a detection circuit for outputting a reset signal for initializing the operation of the CPU when detected.

2. The push switch is a power switch that turns on or off the portable electronic device by pressing and holding the switch for a predetermined time (t 1) or more, and the time (t 2) is the time (t 1) The portable electronic device according to claim 1, wherein the portable electronic device is longer than 1).

3. Input the open / closed state of the power switch (1) from the CPU (3 input port or-++), and operate according to the software to determine whether the power switch (1) is pressed and held for more than a certain time (t1). When the CPU (3) detects that the power is on for a certain period of time (t.1): If the CPU (3) detects that the key is pressed for more than a certain period of time, the CPU (3) turns off all or part of the power of the portable electronic device The detection circuit (2) detects by a hardware circuit whether or not it can be kept pressed for a certain period of time (t2) irrespective of the CPU (3) operating according to the software. 3. The method according to claim 2, wherein (2) outputs a reset signal for initializing a software operation of the CPU (3) upon detecting a press and hold for a predetermined time (t2) or more. Portable electronic devices.

4. A CPU (3) that operates according to the software stored in the memory, a display device (5) that displays display data output from the CPU (3) so that the user can view the data, and a user operation. Button (4) that outputs the data to the CPU (3), a battery (6) that drives the portable electronic device, the push-type power switch (1) that opens and closes the electrical contacts, and a push button. Type power switch (1)-before detecting if it is kept pressed for more than a fixed time (t2) 4. The portable electronic device according to claim 3, comprising a detection circuit.

5. The output is enabled when at least one of the two conditions is met. An OR circuit (7) and the output of the OR circuit (7) controls the CPU (3) power supply. A power control circuit (8), and one of the two conditions of the OR circuit (7) (j1) is satisfied by pressing the push-type power switch (1), and the other condition (j 2) is established when the output port of the CPU (3) operating according to the software outputs a logical value of 1 or 0, and when the condition (j2) is satisfied, the push-type power switch (1) is activated. ) .Open / close state is input at the input port of the CPU (3), and the CPU (3) that operates according to the software detects whether or not it can be kept pressed for a certain period of time (t1). If it is detected that (1) has continued for more than the fixed time (t1), the CPU (3) satisfies condition (j2) '. The logic value of the output port of the CPU (3) is controlled to switch from the state to the state that does not hold. The detection is performed by the hardware main circuit irrespective of the CPU (3), and the detection circuit. (2) initializes the software operation of the CPU (3) when detecting the pressing and holding for a certain time (t.2) or more. 3. The portable electronic device according to claim 2, wherein the portable electronic device outputs a reset signal for resetting.

6 '. CP ϋ (3), which operates according to the software stored in memory, a battery (6), which drives a portable electronic device, and a push-type power switch (1), which opens and closes electrical contacts. 6. The mobile phone according to claim 5, further comprising a detection circuit (2) for detecting whether or not the push-type power switch (1) is kept pressed for a predetermined time (t2) or more. Type electronic equipment.

7. The push-type power switch (1) is composed of a pull resistor and an electrical contact, and the OR circuit (7) is composed of two diodes. Item 6. The portable electronic device according to Item 6.

8. Regarding the time for which the push-type power switch (1) is kept pressed, the detection circuit (2) detects the fixed time (t1) rather than the fixed time (t1) detected by the CPU (3) operating according to the software. 8. The portable electronic device according to claim 1, wherein (t 2) is longer.

9. The portable electronic device according to claim 1, wherein the movable part of the push-type power switch (1) has a waterproof structure.

10. Hysteresis for changing the gradual rise or fall of the potential of the output signal line 22 of the detection circuit (2) into a sharp potential change at a certain potential level as a boundary.

9. The portable electronic device according to claim 1, further comprising a buffer 271, which has 10 lysis characteristics.

1 1. The output of the OR circuit (7) that enables the output when at least one of the two conditions is satisfied, and the power of the CPU (3) by the output of the OR circuit (7)

A power supply control circuit that controls .. (8) and an i5 voltage detection circuit (82) that monitors the output voltage of the power supply control circuit (8), and an OR circuit (7) One of the conditions (j1) · is satisfied when the push-type power switch (1) is pressed, and the other condition (j2) is when the output port of the CPU (3) that operates according to the software is 1 The condition is satisfied by outputting a logic value of 0 and 0, and when the condition (j 2) is satisfied, the open / close state of the push-type power switch (1) is input at the input port of the CPU (3) for a fixed time of 0 hours. The CPU (3) operating according to the software detects whether or not the push-type power switch (1) is pressed and held for more than (t1). Upon detection, the CPU (3) controls the logical value of the output port of the CPU (3) so as to switch from the state where the condition (j 2) is satisfied to the state where the condition (j 2) is not satisfied. The detection circuit (2) detects by a hardware circuit whether or not the button is kept pressed for a certain period of time (t 2) irrespective of the CPU (3) operating according to the soft-to-five function, and the detection circuit (2) The power supply control circuit detects the pressing and holding for more than a certain time (t2). The voltage detection circuit (82) lowers the output voltage of (8), and the voltage detection circuit (82) outputs a reset signal for initializing the soft-fuser operation of the CPU (3) when detecting the reduction of the output voltage of the power supply control circuit (8). 3. The portable electronic device according to claim 2, wherein the output is performed.