JPS62226213A - Power supply control system - Google Patents

Abstract

PURPOSE:To control a power supply in a simple way by providing a flag register to a power supply control circuit to inform the propriety for break of the power supply through a program. CONSTITUTION:A central processing unit 1, a main storage device 2 and a flag register 3 are connected with each other via a common bus 7. Then the ON/OFF control is carried out to a power supply 6 by means of power supply switch 4 via a power supply control circuit 5. The write control of the register 3 is possible through the unit 1 in accordance with an instruction of the program of the storage device 2. Then the register 3 is read by an instruction of the circuit 5. Thus the information showing the ON/OFF state of the switch 4 as well as the store information on the register 3 are used as the control information on the circuit 5. Thus the circuit 5 performs the ON/OFF control of the power supply 6 in accordance with both information.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a power supply control system, and more particularly to a power supply control system for controlling on/off of a device power supply in an information processing apparatus.

BACKGROUND ART Conventionally, in an information processing device, if an operator, who is a user, inadvertently turns off the power of the device while information processing is being executed,
There are processing situations in which normal processing operation cannot be guaranteed when the power is turned on thereafter. For example, there may be a case where the power is turned off while the data is being written to an external storage device before the original storage format is fully established.

In order to avoid such a situation, a method of controlling power supply on/off using a program has been considered.

In the conventional method using this program, the -H program is notified that the power switch is turned off by an operation such as a sense or an interrupt, and a pre-installed power-off processing program is started and the process currently being executed is terminated when the power is turned off. The system allows the system to transition to a state where there are no inconveniences, and then turns off the power again under program control.

However, in such a conventional method, it is necessary to prepare a power-off processing program assuming all processing situations of the information processing device. Furthermore, assuming a situation where a plurality of processes operate in parallel at the same time, there is a drawback that it is almost impossible to create a processing program that takes all processing operations into full consideration.

Purpose of the Invention The present invention has been made to eliminate the drawbacks of the above-mentioned conventional methods, and its purpose is to eliminate the need for special operations such as sensing and interrupts, and to eliminate the need for special power-off processing programs. It is an object of the present invention to provide a power supply control method that can realize power on/off control in an extremely simple method without incorporating a power supply.

Structure of the Invention According to the present invention, there is provided a power control system for controlling the power on/off of an information processing device, which includes a register means for storing information on whether or not the power can be cut off from a program that defines a processing procedure of the information processing device. There is a power supply control system (q) characterized in that the power supply can be cut off only when the information stored in the register means indicates that the power supply can be cut off.

Example Hereinafter, the present invention will be explained in detail using the drawings.

In the figure, a central processing unit 1, a main memory 2, and a flag register 3 are connected to each other via a common bus 7. The power switch 4 is a switch for controlling the on/off of the power source 6 based on the operator's operation.
The power switch 4 is not designed to directly turn on and off the power source 6, but as shown in the figure, the power source 6 is controlled to be turned on and off via a power control circuit.

In addition to the information indicating the on/off state of the control source switch 4 of the power supply control circuit 5, the information stored in the flag register 3 is used.

The power supply control circuit 5 performs on/off control of the power supply 6 in accordance with this image information.

The flag register 3 can be write-controlled by the central processing unit 1, and the write control is performed according to instructions from a program in the main storage device 2. The readout of the flag register 3 is performed according to instructions from the power supply control circuit 5, and the power supply switch 4 (which can be operated by an operator) is configured such that the on/off state of this switch 4 is read by the power supply control circuit 5.

Here, when the power switch 4 is in the on state, the logic is "1".
It is also assumed that logic "0" is read by the power supply control circuit 5 in the off state. Furthermore, if the information stored in the flag register 3 is a logic "1", it indicates that the power supply 6 cannot be cut off, and if it is a logic "0", it indicates that it is possible. and,
In the power supply control circuit 5, the power supply 6 is turned off only when the state of the power switch 4 and the contents of the flag register 3 are both rOJ, and in other cases, the power supply 6 is not turned off. shall be taken as a thing.

In such a configuration, when the power is initially turned on, it is assumed that the contents of the flag register 3 are "0", and the state value of the power switch 4 is [1]. When the power is turned off, the contents of the flag register 3 and the state value of the power switch 4 are both "0", so the power control circuit 5 turns off the power 6.

When power is controlled by a program after the power is initially turned on, the process is as follows. If you want to execute a process that will cause an inconvenience if the power is turned off after starting the program IJ+ operation, set the flag register 3 to [1] in the program before starting the process.
It is controlled so that rOJ is sent in and out, and rOJ is sent in and out at the end of processing 1 yen:2. This eliminates the need for an operator during processing. Even if the power switch 4 is turned off and the switch state changes to "0", the power control 11 circuit 5 does not turn off the power supply 6 because the content of the flag register 3 is "1". Since "O" is written in the flag register 3 by the program only after the processing is completed, the power supply 6 is turned off for the first time at this point.

As described in detail, according to the present invention, a power supply control circuit;
The power supply control circuit is provided with a flag register for notifying the program whether or not the power can be cut off, and the flag register is used to notify the program whether or not the power can be cut off. There is an effect that the power supply control 11 can be realized in a simple manner without using an interrupt or the like and without incorporating a separate power cutoff processing program 171.

[Brief explanation of drawings]

The figure is the fruit of the present invention/Il! FIG. Explanation of symbols of main parts 1...Central processing unit 3...Flag register 4...Power switch 5...Electric J≦1 system U11 circuit 6...Power supply

Claims (1)

[Claims] A power supply control method for controlling power on/off of an information processing device, comprising a register means for storing information on whether or not power can be cut off from a program that defines a processing procedure of the information processing device,
A power supply control method characterized in that the power supply can be cut off only when the information stored in the register means indicates that the power supply can be cut off.