JPS61150053A - Computer system - Google Patents

Abstract

PURPOSE:To attain re-activation without initializing a file at time of power failure restoration by waiting the completion of the transfer of data in the midst of transferring so as to interrupt the transfer when a non-maskable interruption command from a power failure detecting circuit is received. CONSTITUTION:When a main program 23 transfers a file for comprising one datum by two or more bytes, a data shifting program 24 confirms the presence or absence of power failure upon the termination of the data moving. If power failure is found, the program is stopped. Otherwise, the processing is continued. A power failure detecting and interrupting program 25 activated by a detecting signal from the power failure detecting circuit immediately sets power failure detecting information, and checks whether or not the data shifting program is executed. If data shifting information is set, an operation is returned to the data shifting program 24 as it is. Otherwise, the main program 23 stops the program not so as to execute it.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a computer system that is controlled by a central processing unit (hereinafter referred to as CPLI) and transfers data in predetermined units.

[Technical background of the invention and its problems]

Files that consist of one data with 2 bytes or more are
FIG. 5 shows a functional block diagram of a conventional computer system that transfers data from one area to another according to lIJtml of PLJ. The configuration is such that an initialization program 12 and a main program 13 operate under the control of an operating system 11. The main program 13 has a function for setting information during data transfer.

If the power supply to this computer system is cut off due to a power outage or the like while a data file is being transferred, a situation will occur in which the data in the file will not be transferred correctly.

Therefore, it is determined whether data was being transferred when the power was restored, and if data was being transferred, the initialization program 12 performs file initialization such as zero clearing or reloading as necessary.

In this way, in conventional computer systems, if the power supply is cut off and the main program stops while moving the file, the data in the file will be destroyed, so it is necessary to initialize the file after the power is restored. was there.

Therefore, there is a problem in that a break occurs in the flow of data when there is a momentary power outage, etc., and smooth control is obstructed.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a computer system that can be restarted without initializing files upon recovery from a power outage.

[Summary of the invention]

In order to achieve the above object, the computer system according to the present invention is controlled by a central processing unit and transfers data in predetermined units. and a data transfer means that, when receiving the interrupt command during data transfer, completes the transfer of the predetermined unit of data and then stops transferring the next data. Features.

[Embodiment of the Invention] FIG. 1 shows a functional block diagram of a computer system according to an embodiment of the present invention, which includes an operating system 21, an initialization program 22, a main program 23, a data movement program 24, and a power failure detection system. An interrupt program 25 is also added. The data movement program 24 is provided in consideration of power outage countermeasures and is started by the main program 23. Further, the power failure detection interrupt program 25 is a non-maskable interrupt program for notifying the data movement program 24 that there has been a power failure when a power failure occurs.

FIGS. 2 and 3 are flowcharts for explaining the operations of the data movement program 24 and the power failure detection interrupt program 25. When the main program 23 transfers a file consisting of one data of two or more bytes to another area, the data movement program 24 is called. The called data movement program declares the start of data transfer for each data transfer unit and sets data movement information (step 2o1). Then, the file is moved according to the specifications of the main program 23 (step 20
2). When the data movement is completed, the data transfer is declared complete and the information being transferred is reset (step 2o).
3). At the end of this data movement, the data migration program 24 checks whether there is a power outage (step 204), and if there is a power outage, the main program 23 stops the program so that it does not run the program cursorily (step 205). When there is no power outage, return to the main program 23 and continue processing (step 206).
.

A power failure detection circuit is provided in the hardware configuration to detect Nm interruption of the power supply and transmit it to the CPLJ as a non-maskable interrupt command, and is activated by a detection signal from the hardware power failure detection circuit. The power failure detection interrupt program 25 immediately sets power failure detection information (step 301). and check if data movement 70g24 is running step 3o2
), if the data movement information is set in step 201, the process returns to the data movement 70gram 24 (step 3o3). If not, the main program 23 further stops the program so that it does not execute the program (step 304).

Note that since the power failure detection information is set in the power failure detection interrupt program, it is possible to initialize the refile in the conventional manner if necessary after the power failure returns.

FIG. 4 is a block diagram showing a specific example of the hardware configuration of the computer system according to the present invention. The power supply 41 is supplied to the cPU power supply 43 via the power supply voltage conversion circuit 42: variable m21L,
It is supplied to CPLJ45.

A power outage detection circuit 4 is used to detect a power outage of the power supply 41.
4 is provided, and the detection signal is transmitted to the CPU 45 as a non-maskable interrupt command.

via a data bus 46 that couples to the CPU 45;
A random access memory (RAM) 47, a read only memory (ROM) 48, and an input/output device 49 are coupled to the memory 45, and data is transferred between them.

〔Effect of the invention〕

As described above, the present invention is configured to wait for the completion of the data being transferred and then cancel the transfer of the next data when receiving the Nosmus force pull interrupt command from the power failure detection circuit, so that the main program Since the stop always occurs at the end of the movement of one data unit, there is no need to initialize the file after the power is restored. Therefore, even if a power outage occurs, there will be no break in the data flow, allowing smooth control to continue.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram for explaining the operating functions of a computer system according to an embodiment of the present invention, FIG. 2 is a flowchart of a data movement program used in the computer system, and FIG. FIG. 4 is a block diagram showing a specific example of the hardware configuration of the computer system, and FIG. 5 is a functional block diagram showing the operating functions of the conventional computer system. 41... Power supply, 44... Power outage detection circuit, 45.
...CPU, 46...Data bus, 47...RAM
. 48...ROM, 49...I/O device. Applicant's agent Kiyoshi Inomata Figure 4

Claims (1)

[Claims] In a computer system that is controlled by a central processing unit and performs data transfer in predetermined units, there is provided a power failure detection means that detects a power outage of a power supply and issues an interrupt command to the central processing unit; A computer system comprising: data transfer means for completing the transfer of the predetermined unit of data and then canceling the transfer of the next data when receiving an interrupt command.