JP2001318741A - Program execution device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a program execution device capable of preventing a processing result from being lost even with a small charging amount of a backup power source. SOLUTION: A detection circuit 20 outputs the detection signal C1 of '0' when a DC voltage Vb is higher than a first threshold voltage and the detection signal C1 of '1' when it is not. An execution circuit 30 is driven by receiving the DC voltage Va at a power source terminal, executes a first kind program at the time of receiving the detection signal C1 of '0' and executes a second kind program for protecting a processing result obtained by executing the first kind program and generates a control signal C2 at the time of receiving the detection signal C1 of '1'. A charging circuit 60 charges the DC voltage Vc. A discharging circuit 50 discharges a charging voltage V2 to the power source terminal of the execution circuit 30 based on the control signal C2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program execution device for executing a computer program (hereinafter, simply referred to as "program").

[0002]

2. Description of the Related Art Conventionally, when an external power supply is cut off during execution of a program, the power supply is immediately switched to a backup power supply and the same program is subsequently executed.

[0003]

However, if the amount of charge of the backup power supply is small, the drive of the program execution device becomes unstable, and the processing results obtained by executing the program up to that point are lost. There was a point.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a program execution device capable of preventing a processing result from being lost even with a small amount of charge of a backup power supply. I do.

[0005]

According to a first aspect of the present invention, a DC power supply voltage is received, and an ON signal is output when the DC power supply voltage is higher than a first threshold voltage, and an OFF signal is output otherwise. A detection circuit that outputs the DC power supply voltage to a power supply terminal, drives the power supply terminal, executes the first type program when the ON signal is received, and executes the first type program when the OFF signal is received. An execution circuit that executes a second type program that protects the processing result obtained, and generates a discharge signal; a charging circuit that charges the DC power supply voltage; and receives the discharge signal, and changes a charging voltage of the charging circuit. A discharge circuit for discharging to a power supply terminal.

A second aspect of the present invention is to output the discharge signal to the discharge circuit when the voltage of the power supply terminal reaches a predetermined second threshold voltage at which the execution circuit can operate. An output circuit is further provided.

[0007] In the means for solving problems according to claim 3,
The second type program includes a process of resetting the execution circuit.

[0008] In the means for solving problems according to claim 4,
The first and second type programs include a process of resetting the execution circuit if the processing results of the first and second type programs do not satisfy a predetermined condition.

[0009] In the means for solving problems according to claim 5,
The charging circuit includes a capacitor that charges the DC power supply voltage.

[0010] In the means for solving problems according to claim 6,
The detection circuit, the execution circuit, the charging circuit, and the discharging circuit are formed on one chip.

[0011]

(Embodiment 1) FIG. 1 is a block diagram showing a program execution apparatus according to Embodiment 1 of the present invention. The program execution device according to the first embodiment includes a power supply circuit 10, a detection circuit 20, an execution circuit 30, an output circuit 40, a discharge circuit 50, a charge circuit 60, an input unit 71, an output unit 72,
It includes a reset circuit 80 and a power supply line 90.

First, the configuration of the program execution device according to the first embodiment will be described.

Power supply circuit 10 receives DC voltage V0 from the outside, generates and outputs DC voltage Va, DC voltage Vb and DC voltage Vc.

The detection circuit 20 receives the DC voltage Vb, generates and outputs a detection signal C1. The detection circuit 20 is a circuit having an inverter function as shown in FIG. 2, for example.
2, Vd is a DC voltage generated by the power supply circuit 10, and other symbols correspond to FIG. Detection circuit 20
May be a circuit other than the circuit shown in FIG.
If b is larger than the threshold voltage c, a detection signal C1 of "0" is output, and otherwise, a detection signal C1 of "1" is output.

An execution circuit 30 shown in FIG. 1 has a power supply terminal connected to a power supply line 90, receives a detection signal C1, and receives a control signal C1.
2 is generated and output. Further, the execution circuit 30 receives the input signal C4 from the input unit 71, generates a processing result C5, and outputs it to the output unit 72.

FIG. 3 is a block diagram showing the internal configuration of the execution circuit 30. The execution circuit 30 includes the interrupt signal generation circuit 3
1, including a CPU 32 and a main memory 33. The interrupt signal generation circuit 31 receives the detection signal C1 and the signal D1 from the CPU 32, and outputs an exclusive OR of the detection signal C1 and the signal D1 to the CPU 32 as a signal D2. The operations of the main memory 33 and the CPU 32 will be described with reference to FIGS. As shown in FIG. 4, when the detection signal C1 is "1" and the signal D1 is "0", the signal D2 is "1" (time ta). In this state, when the detection signal C1 becomes "0", the interrupt signal generation circuit 31 causes the signal D2 to fall (time tb). When receiving the falling edge of the signal D2, the CPU 32 inverts the signal D1 to "1". As a result, the signal D2 becomes "1" again (time tc). Also,
As shown in FIG. 5, when the detection signal C1 is "0" and the signal D1
Is "1", the signal D2 is "1" (at time t).
a). In this state, when the detection signal C1 becomes “1”, the interrupt signal generation circuit 31 causes the signal D2 to fall (time t).
b). When the CPU 32 receives the falling edge of the signal D2,
The signal D1 is inverted to “0”. As a result, the signal D2 becomes "1" again (time tc). As described above, every time the detection signal C1 changes from "0" to "1" or from "1" to "0", the CPU 32 receives the falling pulse (interrupt signal) of the signal D2.

The CPU 32 exchanges processing results obtained by executing data and programs with the main memory 33 and fetches program instructions from the main memory 33. Data and programs stored in the main memory 33 are provided from the input unit 71 (FIG. 1).

The output circuit 40 is connected to the power supply line 90, receives the control signal C2, and outputs a control signal C3. The operation of the output circuit 40 is such that when the control signal C2 is "1", the control signal C3 is fixed to "0", and when the control signal C2 is "0", the voltage V3 is higher than the driving minimum voltage d. C3 is set to "0", and when the voltage V3 is equal to or lower than the driving minimum voltage d, the control signal C3 is set to "1".

The charging circuit 60 receives and charges the DC voltage Vc. This charging voltage is V2. FIG. 6 shows a charging circuit 60.
2 shows an example of the internal configuration. The charging circuit 60 includes a charging completion detection circuit 61, a charging circuit main body 62, and a capacitor 63. 6, Ve is a reference DC voltage generated by the power supply circuit 10, and other symbols correspond to FIG. The charging circuit main body 62 receives the DC voltage Vc and charges the capacitor 63. The charging completion detection circuit 61 controls the charging circuit main body 62 so that the charging voltage V2 becomes equal to the reference voltage Ve. As a result, the charging circuit 60 automatically stops charging when the charging voltage V2 becomes equal to the reference voltage Ve. The charging circuit 60 may be other than the circuit shown in FIG.
Any device that can receive and charge the DC voltage Vc may be used.

The discharge circuit 50 shown in FIG. 1 receives the control signal C3 and the charging voltage V2, and outputs the charging voltage V2 to the power supply line 90 according to the control signal C3. Note that the discharge circuit 50
May output the charging voltage V2 as it is to the power supply line 90, or may convert it to a predetermined voltage and output it to the power supply line 90.

The input unit 71 is, for example, an input interface for inputting data from an external peripheral device, a keyboard, a mouse, or a touch panel.

The output unit 72 is a device that outputs a processing result obtained by executing the program by the execution circuit 30. For example, an output interface that outputs data to an external peripheral device, a liquid crystal panel, or a C
RT or a nonvolatile memory such as a flash memory.

The reset circuit 80 includes a push button switch, and resets the execution circuit 30 by, for example, an operator pressing the push button switch when the program runs away.

The detection signal C1 of "0" is an ON signal, the detection signal C1 of "1" is an OFF signal, and "1".
And the control signal C2 of "0" are discharge signals. The DC voltage Va, the DC voltage Vb, the DC voltage Vc, the DC voltage Vd, and the reference voltage Ve are included in the concept of the DC power supply voltage.

In each signal of all the figures, "0"
And one of "1" is a high potential and the other is a low potential.

Next, the overall operation will be described with reference to FIG.

First, at time t0, DC voltage V0 is set to GN.
D (ground potential), and since the charging circuit 60 is not charged at all, the charging voltage V2 is also assumed to be GND. The detection signal C1 is “0” because the execution circuit 30 is not driven. The voltage V3 of the power supply line 90 is GND, the detection signal C1
Is "0", the control signal C2 is "1", and the control signal C3 is "1".
0 ".

Next, at time t1, the DC voltage V0 rises. According to this, the power supply circuit 10 is driven, and the DC voltage V
a, DC voltage Vb and DC voltage Vc change similarly,
The voltages approach the voltage a1, the voltage a2, and the voltage a3, respectively. The voltage a1, the voltage a2, and the voltage a3 may be different in magnitude from each other, may be equal to each other, and may be either a positive voltage or a negative voltage.

Since the DC voltage Va is applied to the power supply line 90, the voltage V3 of the power supply line 90 is changed to the DC voltage Va.
, And is applied to the power supply terminal of the execution circuit 30. The execution circuit 30 can drive normally when the voltage V3 becomes equal to or higher than the driving minimum voltage d (time t2).

When the DC voltage V0 is in a steady state, the DC voltage Va, the DC voltage Vb, and the DC voltage Vc become the voltage a, respectively.
1, constant at voltage a2 and voltage a3.

The CPU 32 of the execution circuit 30 includes the main memory 3
3 to process the data stored in the main memory 33 by executing the first type program.

The execution of the type 1 program will be described in detail. The first type program includes an OS (operating system), a program for performing a discharge stop process, a program for performing a resume process, and an application program. First, after the OS is started, the control signal C2 of “1” is executed by executing the program for performing the discharge stop processing.
Is output. Next, a program for performing a resume process described later is executed. Next, the application program is executed. For example, the application program processes data input from the input unit 71 by a predetermined arithmetic expression, stores the processing result in the main memory 33, and outputs the processing result from the main memory 33 to the output unit 72 when necessary (for example, , Writing to the non-volatile memory (output unit 72).

Meanwhile, the charging circuit 60 receives and charges the DC voltage Vc, and automatically stops charging when the charging voltage V2 becomes equal to the reference voltage Ve (time t3).

Next, at time t4, the DC voltage V0 is cut off and suddenly becomes GND. As the DC voltage V0 decreases, the DC voltage Va, the DC voltage Vb, and the DC voltage Vc generated by the power supply circuit 10 also approach GND. It should be noted that the DC voltage Va, the DC voltage Vb, and the DC voltage Vc fluctuate more slowly than the DC voltage V0 due to the parasitic capacitance and the like of the power supply circuit 10.

When the DC voltage Vb becomes the threshold voltage c, the detection circuit 20 changes the detection signal C1 from "0" to "1". As a result, an interrupt signal is given to the CPU 32 of the execution circuit 30, and the CPU 32 schedules and executes the second type program (time t5).

The second type program includes a program for performing a suspending process, a program for performing a discharging process, and a program for obtaining a desired processing result. The suspend process is a process of controlling the input unit 71, the output unit 72, and the like to the power saving mode (individual hardware power saving control), and a state in which the suspend process is performed is referred to as a suspend state. First, the input unit 71 and the output unit 72 operate in the power saving mode by executing the program for performing the suspend process. Next, the execution circuit 30 sets the control signal C2 to “0” by executing the program for performing the discharge process (at time t).
6). At this point, the voltage V3 is equal to the driving minimum voltage d.
Thus, the execution circuit 30 can operate normally. next,
A program for obtaining a desired processing result is executed.
By executing this program, here, for example, data write processing is performed, and the processing result C5 obtained by executing the first type program is transferred from the main memory 33 to the non-volatile memory which is one of the output units 72. Is started.

Thereafter, the voltage V3 becomes the minimum drive voltage d (time t7). At this time, the output circuit 40 outputs the control signal C3
To “1”. The discharge circuit 50 outputs the control signal C of “1”.
When receiving the signal 3, the charging voltage V2 is discharged to the power supply terminal of the execution circuit 30 through the power supply line 90. As a result, the voltage V3 of the power supply line 90 increases and becomes higher than the driving minimum voltage d, and the execution circuit 30 can continue stable driving. Since the voltage V3 has become higher than the minimum drive voltage d, the output circuit 40 sets the control signal C3 to "0". When receiving the control signal C3 of "0", the discharging circuit 50 stops discharging the charging voltage V2 to the power supply line 90, and the voltage V3 becomes the driving minimum voltage d. The above is repeated, and the charging voltage V2 is supplemented to the power supply terminal of the execution circuit 30,
The execution circuit 30 can normally execute the program, and can complete the writing of the processing result C5 into the nonvolatile memory. As described above, the processing result C5 obtained by executing the type 1 program can be protected by being written to the nonvolatile memory by the program for obtaining the desired processing result, and can be prevented from being lost.

Each time the discharge circuit 50 is repeatedly discharged and stopped, the charge charged in the charge circuit 60 decreases. At time t8, even if the discharge circuit 50 discharges, the voltage V3 is driven. Since the voltage does not exceed the minimum voltage d, the execution circuit 30 cannot be driven and stops.

If the program execution device malfunctions at time t8, the operator may press the push button of the reset circuit 80 to reset the program.

As described above, the power supply terminal of the execution circuit 30 is supplemented with the voltage discharged from the discharge circuit 50,
The execution circuit 30 can be driven stably until time t8, during which the processing result C5 obtained by executing the type 1 program is protected by a program for obtaining a desired processing result of the type 2 program. The loss can be prevented, and the operator can obtain a desired processing result C5.

By the way, between time t7 and time t8,
Assume that the DC voltage V0 rises again (time t9 in FIG. 8). Accordingly, the power supply circuit 10 is driven, and the DC voltage Va, the DC voltage Vb, and the DC voltage Vc change similarly, approaching the voltage a1, the voltage a2, and the voltage a3, respectively.

When the DC voltage Vb exceeds the threshold voltage c, the detection circuit 20 sets the detection signal C1 to "0". As a result, an interrupt signal is given to the CPU 32 of the execution circuit 30, and the CPU 32 schedules and executes the program for performing the resume processing of the first type program, the program for performing the discharge stop processing, and the application program in order (time t10). The resume process means a process of returning to a state immediately before performing the suspend process, and a state in which the resume process is performed is referred to as a resume state. Basically, control is performed to return the input unit 71 and the output unit 72 to the state immediately before performing the suspend processing (individual hardware return control). Here, the input unit 71 and the output unit 72 are controlled by the DC voltage Va, the DC voltage When Vb and DC voltage Vc become voltage a1, voltage a2, and voltage a3, the state naturally returns to the original state. After the time t10, the voltage V3 of the power supply line 90 sufficiently approaches the voltage a1, and the execution circuit 30 can be driven normally without depending on the charging voltage V2. Then, a program for performing the discharge stop processing is executed, and the CP of the execution circuit 30 is executed.
Upon receiving the interrupt signal, U32 changes the control signal C2 to "
The output circuit 40 fixes the control signal C3 to "0" when receiving the control signal C2 of "1".
0 receives the control signal C3 of “0”, the charging voltage V2
Is stopped from being discharged to the power supply line 90. After that, the application program is executed.

That is, by executing the program for performing the suspending process, the input unit 71 and the output unit 72 are operated in the power saving mode, the consumption of the charge amount of the charging circuit 60 is suppressed, and the execution circuit 30 is driven for a longer time. Then, the execution circuit 30 can wait until the DC voltage V0 rises again. As a result, the processing result C5 obtained by executing the type 1 program can be protected by the execution circuit 30 being put on standby by the program for performing the suspend processing, and can be prevented from being lost.

As described above, the DC voltage Vb is equal to the threshold voltage c.
If it is larger, the first type program is executed. When the DC voltage Vb becomes equal to or lower than the threshold voltage c, the second type program for protecting the processing result obtained by executing the first type program is executed, and the power supply terminal of the execution circuit 30 is connected to the DC voltage Va. Thus, the charging voltage V2 discharged from the discharging circuit 50 is supplemented. Thereby, the execution circuit 3
0 can be driven longer and more stable, while
The processing result obtained by executing the first type program can be protected by the second type program and prevented from being lost.

In some cases, the DC voltage V0 is not cut off, but a slight voltage at which the DC voltage Va is smaller than the minimum drive voltage d is supplied from time t7 to time t8 in FIG. In this case, even when the charging amount of the charging circuit 60 is small, the execution circuit 30 can be stably driven for a long time by the sum of the DC voltage Va and the charging voltage V2 from the charging circuit 60.

Further, the discharging of the discharging circuit 50 described above
By repeating the discharge stop, the amount of power that the voltage V3 reaches the driving minimum voltage d is supplied little by little from the discharging circuit 50. Therefore, even if the charging amount of the charging circuit 60 is small, the execution circuit 30 is driven stably for a long time. Can be done.

Conventionally, if the amount of charge of the backup power supply is small, the processing result obtained by executing the program up to that point is lost, so that the capacitor 63 having a small charge capacity cannot be applied as the backup power supply. According to the present invention, even if the charge amount is small, the processing result can be protected and prevented from disappearing as described above. Therefore, the capacitor 63 can be applied as a backup power supply, and the charging circuit 60 can be configured as a backup power supply with no life, so that there is no liquid leakage unlike a rechargeable battery and no maintenance is required.

The output circuit 40 holds the control signal C3 at "0" when the control signal C2 becomes "1" and replaces the control signal C2 with "0" when the control signal C2 becomes "1". When the voltage V3 becomes equal to or lower than the driving minimum voltage d in the state, the control signal C
A latch circuit that holds 3 at “1” may be used. When a latch circuit is used, time t7 to time t8 in FIG. 7 is always "1". As described above, the output circuit 40 outputs the voltage V
3 outputs a control signal C3 of “0” to the discharge circuit 50 when a predetermined threshold voltage (equal to the driving minimum voltage d in the above description) is reached at which the execution circuit 30 can operate.
As a result, the execution circuit 30 is driven only by the DC voltage Va until the voltage V3 reaches the minimum drive voltage d, so that the execution circuit 30 can be driven stably for a longer time. Note that the preset threshold voltage may be higher than the minimum drive voltage d.

Since the state of the execution circuit 30 is maintained in the suspended state after the DC voltage V0 is cut off, it is not necessary to restart the OS, and the program is immediately started immediately after the DC voltage V0 is turned on. Can be.

When the output circuit 40 is replaced by a latch circuit, a signal from the reset circuit 80 is input to this latch circuit, and if the operator presses a push button of the reset circuit 80, the control signal C3 is set to "0". "May be reset.

The output circuit 40 may be omitted, and the control signal C2 may be provided to the discharge circuit 50. In this case, "0"
Is a discharge signal, the control signal C2 of "1" is a discharge stop signal, and the discharge circuit 50
When receiving the control signal C2 of "0", the charge voltage V2 is discharged to the power supply terminal of the execution circuit 30 via the power supply line 90, and "
When the control signal C2 of 1 ″ is received, the discharging of the charging voltage V2 to the power supply line 90 is stopped.

When the discharge circuit 50 receives the rise of the control signal C3 from "0" to "1", the discharge voltage 50
2 may continue to be discharged to the power supply line 90, and may have a latch function of stopping the discharge when receiving the fall of the control signal C3 from "1" to "0". In this case, a signal from the reset circuit 80 is input to the discharge circuit 50,
If the operator presses the push button of the reset circuit 80, the discharge may be stopped.

The DC voltage Va, the DC voltage Vb, and the DC voltage Vc may be the same DC power supply voltage.

The capacitor 63 of the charging circuit 60 may be replaced by a rechargeable battery.

The second type program may include a program for protecting the processing result other than the program for performing the data writing process and the program for performing the suspending process. For example, a program for displaying the processing result C5 on a liquid crystal panel, which is one of the output units 72, may be used. Alternatively, the program may be a program for resetting the execution circuit 30 to return to the same initial state as when the reset signal C6 is input. in this case,
By resetting, the runaway of the second type program due to unstable driving is prevented, and, for example, the processing result already written in the nonvolatile memory which is one of the output units 72 by the first type program is prevented from being destroyed. be able to.

In the above example, the CPU 32 generates the discharge signal and the discharge stop signal of the control signal C2 according to the instructions included in the first type program and the second type program. Of the detection signal C1
The CPU 3 includes another circuit that generates a signal in accordance with “1” or “0”.
2 may execute the second type program, and the separate circuit may generate the discharge signal and the discharge stop signal.

The first type program includes a program for taking the processing result written in the non-volatile memory into the main memory 33 of the execution circuit 30 immediately after the DC voltage V0 rises. It may include a program for performing processing. According to this, first, when the DC voltage V0 is cut off at the time t4 in FIG. 7, as described above, the program for performing the data writing process in the second type program is executed, whereby the first type program is executed. Is written from the main memory 33 to the non-volatile memory of the output unit 72. Thereafter, when the DC voltage V0 rises again, the program for taking in the above processing result in the first type program is executed, whereby the processing result C5 is written from the nonvolatile memory to the main memory 33. Thus, even if the voltage V3 falls below the minimum drive voltage d before the DC voltage V0 rises, the application program included in the type 1 program sets the processing result C5 written in the main memory 33 as an initial value.
It is possible to start up in the same state as immediately before time t4.

(Embodiment 2) In Embodiment 1,
When the DC voltage V0 is cut off during the execution of the program and the system enters the suspend state from the resume state, the program normally operates due to interruption of the program execution, a low charge amount of the charging circuit 60, or some other cause. May not. If the DC voltage V0 is applied again to resume the program in a state where the program does not operate normally, the state in which the program does not operate normally continues.

That is, conventionally, if the program is not operating normally, the external power supply is cut off and the power is turned on again, so that the program can be started from the beginning and operated normally. However, if the suspend state and the resume state described in the first embodiment are repeated,
Even if the external power supply is cut off and turned on again, there is a problem that the program does not operate normally.

Therefore, in order to solve the above problem, if the program is not operating normally, the execution circuit 30 is reset when performing the suspend process or the resume process (suspend reset, resume reset).

First, the suspend reset is performed as shown in FIGS.
This will be described with reference to FIG. During execution of the type 1 program, a flag is turned on where a malfunction is likely to occur. FIGS. 9 to 9 show examples in which a flag is turned on in a place where a malfunction is likely to occur.
These are listed in FIG. For example, as shown in FIG.
32 turns on the flag (step S12) immediately after starting the OS (step S11), and executes an application program or the like. Then, after a predetermined time has elapsed since the flag was turned on (step S13), the flag is turned off (step S14). Alternatively, as shown in FIG.
U32 executes the flag on instruction of the application program (step S21). As a result, the flag is turned on (step S22). Next, the CPU 32 executes a flag-off command of the application program (step S23). As a result, the flag is turned off (step S24). Alternatively, as shown in FIG.
After starting the resume process (step S31), the CPU 32 turns on the flag (step S32) and executes an application program or the like. Then, after a predetermined time has elapsed since the flag was turned on (step S33), the flag is turned off (step S34). 9 to 11 described above.
The process of setting a flag as shown in (1) is included in the type 1 program.

Next, when the suspend process is performed, if the flag is on, reset is performed. More specifically, referring to FIG. 12, when the suspend process is started (step S41), the CPU 32 determines whether the flag is turned off (step S42). If the flag is off, the CPU 32 continues the suspend process (step S43). On the other hand, if the flag is on, there is a good chance that the program will not work properly,
The CPU 32 resets the execution circuit 30 (Step S
44). The processing as shown in FIG. 12 is included in the type 2 program.

As described above with reference to FIGS.
When performing the suspending process (that is, when receiving an off signal from an on signal), the PU 32 executes the execution circuit 30 if the flag is not turned off (that is, if the processing result of the type 1 program does not satisfy a predetermined condition). Reset. This makes it possible to automatically avoid a state in which the program is not operating normally when the resume state is resumed, and it is not necessary for the operator to confirm whether or not the program can be brought into the suspend state.

Next, the resume reset will be described with reference to FIG. First, when the resume process is started (step S51), a process of displaying a message or the like to the user of the OS shell is performed. It is determined whether or not the display process has been correctly performed (step S52). The determination method can be determined by, for example, storing the shell start condition in a file format in a nonvolatile memory in advance, and comparing the start condition with the result of the shell display processing.
According to such a determination method, if the shell is not normally executed, the execution circuit 30 is reset (step S5).
6) Otherwise, proceed to step S53.

In step S53, it is determined whether or not the number of activated applications is equal to the number of activated applications in the previous resume state. As a confirmation method, for example, the number of activated application programs is checked by a suspend process and stored in the main memory 33 as activation conditions. Then, after the start of the resume processing, it can be confirmed by comparing the number of activated application programs with the number of activated programs stored in the main memory 33. With this verification method,
If the activation number of the application is different from the previous resume state, the execution circuit 30 is reset (step S5).
6) If not, proceed to step S54.

In the step S54, it is determined whether or not the application program is correctly executed.
As in step S52, the determination method can be determined by, for example, storing in advance a condition for activating the application program in a non-volatile memory in a file format, and comparing the activating condition with the execution result of the application program. According to such a determination method, if the application program is not normally executed, the execution circuit 30 is reset (step S56), and if not, the resume processing is continued (step S55).

Steps S52 to S54
May be configured to be selectively executed.

As described above with reference to FIG.
2 indicates that when the suspend process is performed (that is, when an ON signal is received from an OFF signal), if the processing result of the OS shell or the application program does not satisfy predetermined conditions stored in the nonvolatile memory or the main memory 33,
The execution circuit 30 is reset. This makes it possible to automatically avoid the state where the program is not operating normally when the resume state is resumed, and it is not necessary for the operator to start up the program.

Further, by performing a suspend reset or a resume reset, as in the first embodiment, runaway of the second type program due to unstable driving is prevented, and the processing result obtained by executing the first type program is obtained. Can be protected.

(Application Example of the Present Invention) The program execution device of the present invention may be any device that executes a program. For example, a control device for controlling machines constituting a production line of factory automation (FA), a personal computer It may be applied to such as. Alternatively, among the components of FIG. 1, at least the detection circuit 20 and the execution circuit 3
0, the charging circuit 60, and the discharging circuit 50 may be formed on one chip and applied to a one-chip microcomputer called a DSP (Digital Signal Processor). In particular, in the system in which the DC voltage V0 frequently rises again after the DC voltage V0 is cut off (time t4) until the voltage V3 falls below the minimum drive voltage d (time t8) in FIG. If it is applied, the program can be immediately started immediately after the DC voltage V0 is applied, which is effective.

[0071]

According to the first aspect of the invention, if the DC voltage is higher than the first threshold voltage, the first type program is executed. When the DC voltage becomes equal to or lower than the first threshold voltage, the second type program for protecting the processing result obtained by the first type program is executed, and the power supply terminal is discharged from the discharge circuit in addition to the DC voltage. The charging voltage is supplemented.
As a result, the execution circuit can be driven stably for a longer time, and in the meantime, the processing result obtained by executing the first type program can be protected by the second type program and prevented from being lost. it can.

According to the second aspect of the present invention, the execution circuit is driven by the DC power supply voltage until the voltage of the power supply terminal reaches the second threshold voltage. Thus, the execution circuit can be driven stably for a longer time.

According to the third aspect of the present invention, the execution circuit is reset by the second type program to prevent runaway of the second type program, thereby protecting the processing result obtained by the first type program. can do.

According to the fourth aspect of the present invention, it is possible to avoid a state where the first type and second type programs are not operating normally.

According to the fifth aspect of the present invention, since the second type program for obtaining the desired processing result is executed instead of the first type program, the desired processing result is obtained even if the charging capacity of the charging circuit is small. Can be obtained. Therefore, a sufficient effect can be obtained even if the charging circuit is configured using a capacitor having a small charging capacity, and the charging circuit can be configured as a backup power supply having no life.

According to the invention, the capacitor can be used as a backup power supply.
It is possible to obtain a program execution device composed of one chip with a backup function.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a program execution device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a detection circuit according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating an execution circuit according to the first embodiment of the present invention.

FIG. 4 is a timing chart illustrating an operation of the execution circuit according to the first embodiment of the present invention.

FIG. 5 is a timing chart showing an operation of the execution circuit according to the first embodiment of the present invention.

FIG. 6 is a block diagram illustrating a charging circuit according to the first embodiment of the present invention.

FIG. 7 is a timing chart illustrating an operation of the program execution device according to the first embodiment of the present invention.

FIG. 8 is a timing chart showing an operation of the program execution device according to the first embodiment of the present invention.

FIG. 9 is a flowchart showing an operation of the program execution device according to the second embodiment of the present invention.

FIG. 10 is a flowchart showing an operation of the program execution device according to the second embodiment of the present invention.

FIG. 11 is a flowchart showing an operation of the program execution device according to the second embodiment of the present invention.

FIG. 12 is a flowchart illustrating an operation of the program execution device according to the second embodiment of the present invention.

FIG. 13 is a flowchart showing an operation of the program execution device according to the second embodiment of the present invention.

[Explanation of symbols]

10 power supply circuit, 20 detection circuit, 30 execution circuit, 4
0 output circuit, 50 discharging circuit, 60 charging circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuhei Sugai 1-7-131 Nishinomiyahara, Yodogawa-ku, Osaka City Inside Izumi Electric Co., Ltd. F term in the company (reference) 5B011 DA06 DA13 GG03 HH02 JA01 JA04 JB03 LL11 MB07 5G015 FA16 GB10 JA34 JA62 KA06

Claims (6)

[Claims] A detection circuit that receives a DC power supply voltage and outputs an ON signal when the DC power supply voltage is greater than a first threshold voltage, and an OFF signal when the DC power supply voltage is not greater than a first threshold voltage; And executes the first type program upon receiving the ON signal, and executes the second type program which protects the processing result obtained by executing the first type program upon receiving the OFF signal. A program execution device comprising: an execution circuit that generates a discharge signal; a charging circuit that charges the DC power supply voltage; and a discharge circuit that discharges a charging voltage of the charging circuit to the power supply terminal when receiving the discharge signal. . 2. An output circuit that outputs the discharge signal to the discharge circuit when the voltage of the power supply terminal reaches a second predetermined threshold voltage at which the execution circuit can operate. The program execution device according to the above. 3. The program execution device according to claim 1, wherein the second type program includes a process of resetting the execution circuit. 4. The first type and second type programs include:
2. The program execution device according to claim 1, further comprising a process of resetting the execution circuit if the processing results of the first type and second type programs do not satisfy a predetermined condition. 5. The program execution device according to claim 1, wherein said charging circuit includes a capacitor for charging said DC power supply voltage. 6. The program execution device according to claim 5, wherein said detection circuit, said execution circuit, said charging circuit, and said discharging circuit are formed on one chip.