JPH06149423A - Power source turning-off device - Google Patents

Abstract

PURPOSE:To turn off a power source by performing turn-off preprocessing by a turning-off operation by means of a hard switch for turning on/off the power source. CONSTITUTION:This power source turning-off device turns off a device power source 22 after performing prescribed turn-off preprocessing corresponding to the setting of turn-off conditions by means of a switch 20 for turning on/off the power source. This device is provide with a protect circuit 21 for blocking the report of turn-off condition setting to the device power source 22, power source turn-off preprocessing part 23 for performing the prescribed power source turn-off preprocessing corresponding to the setting of turn-off conditions, and protect cancel part 24 for reporting the setting of turn-off conditions to the device power source 22 by canceling the report block of the protect circuit after the power source turn-off pre-processing is completed by the power source turn-off preprocessing part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data processing device, and in particular, at the time of setting a power-off condition (power switch off) by a hard switch for power-on / off, the power is turned off after an appropriate pre-power-off preprocessing is performed. The present invention relates to a power disconnecting device for disconnecting.

In a data processor, it is necessary to prevent the power from being cut off when the power supply cannot be cut off, such as during access to a file medium or data transfer through a line connection. For this reason, in the related art, the power is not cut by a hard switch dedicated to the power supply, such as a seesaw switch, but the power is cut by a cutting switch provided separately. This is because when this disconnection switch is pressed, an interrupt occurs in the CPU, and the CPU turns off the power after performing pre-power-off preprocessing such as saving data files.
If the switch for disconnection is turned off (setting of disconnection conditions), there is a risk that data may be destroyed because proper power-off preprocessing is not executed to directly disconnect the power supply of the device.
Therefore, there is a need for a power disconnection device that prevents such an erroneous operation.

[0003]

2. Description of the Related Art FIG. 5 is a block diagram of a conventional example. Figure 5
Power is supplied to the power supply unit 2 (the voltage generating circuit is not shown), and DC (direct current) to the apparatus main body 1 is supplied.
It shows a case where the output is turned on / off.

The power supply unit 2 has a terminal for inputting a signal for turning on / off the DC output and a terminal for inputting a signal for turning off the DC output. A power-on / off switch S1 is connected, and a disconnection signal line from the data processing unit 9 is connected to a terminal.

Now, JK FF (JK flip-flop) 8
Q output (POWON 2) of is assumed to be initialized to'H '. That is, when the power supply unit 2 is powered on and the voltage Vd is generated and it is in the operating state, * PR of JK FF8
Set the E terminal to "L" and set the Q output of JK FF8 to "H". Here, since the terminal is'H ', JK FF8
J input is'L ', * H input is'H', oscillator 6
Even if the clock is input to the CLK terminal of JK FF8 from Q output, the Q output is kept at “H”.

For this reason, since the power-on / off switch S1 is initially off, * POWON is'H '(OFF), and the inverter 4 causes POWON 1 to be'L', therefore DCOU.
T (DC output command) becomes'L ', and DC output is not output from the DC power output circuit 3.

In the above-mentioned initial state, when the power-on / off switch S1 is turned on (* POWON is'L '), the terminal becomes'L' and POWON 1 becomes'H ', and POWON
Since 2 is'H ', DCOUT becomes'H' and DC
The output turns on.

When the power-on / off switch S1 is turned off, DCOUT becomes "L" and the DC output is turned off. Therefore, when the power-on / off switch S1 is turned off, the power of the apparatus body 1 is immediately cut off,
Appropriate evacuation processing cannot be performed.

Therefore, when the power is cut off, the interrupt generating switch S2 is used. The switch S2 is, for example, one of the normal function keys specified on the screen. When the specified interrupt generation switch S2 is turned on in the DC output state, the processor in the data processing unit 9 is activated. An interrupt occurs. This causes the processor to execute * SPOFF (software power off) after executing pre-disconnection processing corresponding to the processing at that time, such as saving files.
To'L '. As a result, the J input of JK FF8 becomes'H 'and the * K input becomes'L', so the Q output of JK FF8 is inverted at the timing of the clock output from the oscillator 6, and POWON 2 becomes'L '. Therefore, DCOUT is'L '
And the DC output is turned off. Even if * SPOFF becomes'H 'because the DC output is turned off, JK FF8
J input is'L ', * K input is'H', so JK FF8
Output does not change and POWON 2 keeps'L '. Therefore, the DC output remains off.

When the power is turned on again, the power-on / off switch S1 is once turned off and then turned on. At this time, although not shown, this OFF signal sets * PRE of JK FF8 to “L” and POWON 2 to “H”. As a result, the power supply unit 2 is in the above-described initial state, so that the power can be turned on again by turning on the power-on / off switch S2.

[0011]

As described above,
In the conventional device, the power source preprocessing is not performed unless the power source is turned off by the interrupt generation switch S2. For this reason, if the power-on / off switch for directly instructing on / off of the power supply unit is accidentally turned off, the power is cut off without performing the evacuation process, which causes a problem that data is destroyed.

In view of the above problems, it is an object of the present invention to provide a power supply disconnecting device in which the power supply is disconnected after the appropriate pre-processing is executed by turning off the hard switch for powering on / off. And

[0013]

In the principle diagram of the present invention, reference numeral 20 is a switch for turning on / off a power source, and 22 is a power source for the apparatus. Reference numeral 21 is a protection circuit, which is a device power supply for setting the disconnection condition of the switch 20 for powering on / off (disconnection instruction state) 22
Block notifications to. Reference numeral 23 is a power-off preprocessing unit that performs power-off preprocessing by setting a disconnection condition by the switch 20.
A protect canceling unit 24 cancels the notification blocking of the protect circuit 21 and notifies the device power source 22 of the cutting condition setting when the pre-cutting process by the power-off preprocessing unit 23 is completed.

[0014]

[Function] When the power-on / off switch 20 is set to the power-off side (disconnection condition setting), the protection circuit 21
Stops the notification of this disconnection condition setting to the device power supply 22. On the other hand, the power-off preprocessing unit 23 executes the power-off preprocessing by the setting of the disconnection condition, and the protect canceling unit 24
After the completion of the pre-disconnection process, the protection circuit 21 is released from protection and the device power supply 22 is notified of the disconnection condition setting.

As described above, by turning off the power-on / off switch 20 for directly turning on / off the power of the apparatus, the power is turned off after the pre-cut processing is executed. It is not necessary to depress the switch for use, so that the data being processed is not destroyed by an erroneous operation.

[0016]

FIG. 2 is a block diagram of an embodiment, FIG. 3 is an operation flow chart, and FIG. 4 is an operation time chart when the protection is released.

In FIG. 2, S3 is a power-on / off switch (corresponding to the switch 20 in FIG. 1) having two sets of contacts (S3-1, S3-2, one contact for two circuits) which are turned on / off at the same time. ), One circuit S3-1 is connected to the power-on / off signal input terminal of the power supply unit 30, and the other circuit S3-2 is connected to the CPU15.
Connected to inverter 14 for an interrupt signal to. The reason for providing these two circuits is that when the power-on / off switch S3 is turned off, the disconnection signal to the power supply unit 30 is released until the circuit S3-1 is protected by the wired OR with the illustrated open collector inverter 13. Is not generated (* POWON remains'L ') and cannot be shared for interrupts. S4 is a reset switch for forcibly canceling the protection of the protection circuit 11 by hardware. 11 is a protect circuit, which is a D-FF (D-type flip-flop) to which a predetermined address is given.
And an open collector inverter 13, the output of the open collector inverter 13 and one circuit S3-1 of the power on / off switch S3 are connected and wired OR. Therefore, when both signals, S3-1 are off and the open collector inverter 13 becomes'H ', the disconnection signal (* POWON'H') by the power on / off switch S3 is input to the power supply unit 30. To be done. 15
Is a processor unit CPU that performs data processing of the data processing apparatus, and writes (writes) a protect signal ('H') and a protect release signal ('L') to D-FF12. 16 is an address decoder, D-FF 12
When the address signal is output, it becomes'L '. Reference numeral 17 denotes an OR circuit, which outputs'L 'when the D-FF 12 is addressed and the write signal (* WT signal) is output.
As a result, as shown in FIG. 4, the data signal is written in D-FF 12 at the rising edge of the * WT signal. Other, R4
Is a resistor for wired OR, R3 is an inverter when S3 is off
It is a resistor for fixing 14 input signals to'H '. In addition, the power-off preprocessing unit 23 and the protection release unit 24 of FIG.
Corresponds to the processor unit CPU15.

With the above configuration, the following processing is performed. Turn on the power-on / off switch S3. As a result, * POWON becomes'L ', so DCOUT (DC output command at'H') becomes'H 'via the inverter 31, and D
DC is output from the C power supply output circuit. As a result, the DC power is turned on to the apparatus main body and the system starts up, and resetting of each unit, checking of each unit, initial setting, etc. are performed. At the time of this initialization, the CPU 15 outputs the address given to the D-FF 12 and the protect signal'H '. As a result, the address decoder 16 detects that D-FF 12 has been designated, and the protect signal'H 'is written to D-FF 12 at the rising edge of the * WT signal. This allows
The Q output of D-FF 12 becomes'H '. This signal is inverted by the open collector inverter 13, and the power supply unit 30
Hold the power on / off terminal at'L '(power on). After that, the application program is executed. When the power on / off switch S3 is turned off (OFF), the output from the open collector inverter 13 causes S3-2
Side is still held at'L ', but from the S3-2 side, C
An interrupt is generated in the PU 15 via the inverter 14. As a result, the CPU 15 performs a predetermined pre-disconnection process (a process when the system is down) and then performs a protection release process. This is done by writing'L 'to D-FF 12. As a result, the Q output of D-FF 12 becomes'H 'and'H' (disconnect signal) is input to the power on / off signal terminal of the power supply unit 30.
Is input, DCOUT becomes “L”, and the DC output is turned off. The timing is shown in FIG.

At this time, the power-on / off switch
Since S3 is off and the output of the open collector inverter 13 is'H ', the power on / off switch S3
The power can be turned on again by turning on.

If the power is not cut off due to software runaway or the like, the reset switch S4 is turned on. As a result, D-FF 12 is cleared and the Q output becomes “L”, so that the DC output can be cut off.

As described above, the power is turned on for two circuits and one contact.
By using the disconnection switch, it is possible to realize the simple protection circuit 11, it is not necessary to operate the switch for generating the interrupt, the operation is simple, and the data is not destroyed by an erroneous operation.

In the embodiment, turning on / off of the DC output is taken as an example, but the primary line of the power supply unit 30 can be applied to turning on / off. In this case, the inverter 31,
As a power source for R4, the battery built into the data processing device will be used.

The cutting condition setting notice is not limited to the method of protecting the disconnection condition setting notification by the wired OR, but a normal OR circuit may be used. In this case, one switch with one contact can be used as the power-on / off switch S3.

[0024]

As described above, the power supply disconnecting device of the present invention provides a power supply disconnecting device that protects the disconnection signal output from the power on / off switch until the completion of the pre-disconnection process. As described above, a disconnect switch for software is not necessary, and an erroneous operation of disconnecting the power source is eliminated, so that there is an operational effect such that data destruction can be prevented.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment.

[Fig. 3] Operation flowchart diagram

[Fig. 4] Operation time chart diagram when protection is released

FIG. 5 is a block diagram of a conventional example

[Explanation of symbols]

1 Device Main Body 2 Power Supply Unit 3 DC Power Supply Output Circuit 4 Inverter 5 AND Circuit 6 Oscillator 7 Inverter 8 JK
FF 9 Data processing unit 10 Open collector inverter 11 Protect circuit 12 D-FF 13 Open collector inverter 14 Inverter 15 Processor unit CPU 16 Address decoder 17 AND circuit 20 Switch 21 Protect circuit 22 Device power supply 23 Power off preprocessing unit 24 Protect release unit 30 Power supply unit 31 Inverter R1 to R4 Resistors S1, S3 Power on / off switch S2 Interrupt generation switch S4 Reset switch

Claims (1)

[Claims] 1. A switch (2) for turning the power on and off
A power-off device for cutting off the device power supply (22) after performing a predetermined power-off pre-processing by setting the disconnection condition according to (0), and a protection circuit for blocking notification of the cutting condition setting to the device power supply. (21), a power-off pre-processing unit (23) that performs a predetermined power-off pre-processing by setting the power-off condition, and after the power-off pre-processing unit finishes the power-off pre-processing, the notification blocking of the protect circuit is performed. A power supply disconnecting device, comprising: a protection releasing section (24) for releasing and notifying the device power supply of the disconnection condition setting.