JPH0566936A - Data processor - Google Patents

Abstract

PURPOSE:To correct a processing program with high efficiency by loading only an erroneous part of the processing program. CONSTITUTION:A processing program is loaded from an external storage 13 and stored in a designated memory area of a program RAM 22. Then the processing program is read out for each byte and undergoes the check sum check. If a wrong data is included in the 1-byte data, both row and column addresses of the data are stored in an address register of a CPU 21. Thus a down load program memory area 23-1 is designated and a down load program is started if a wrong data is detected. Then the row and column addresses are read out of the address register of the CPU 21 in a check processing state. Then the corresponding data equivalent to one byte are loaded in the designated area of the RAM 22 from the storage 13, and the processing program is corrected.

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 such as an electronic cash register for processing data according to a processing program loaded from an external storage device such as a magnetic disk.

[0002]

2. Description of the Related Art Conventionally, electronic cash registers (EC
In a data processing device such as R), a processing program (application program) is loaded from the magnetic disk device into the RAM, which is an internal memory, and then the RA
The sales data is processed according to the processing program in M. In this case, a so-called soft error may occur in the memory IC due to its structure and manufacturing. Here, the soft error is different from the one caused by the cell destruction of the memory IC, and indicates the one which operates normally when the correct processing program is loaded again.

[0003]

However, if data corruption occurs in the processing program in the RAM and erroneous data is received from the RAM, the system runs out of control (system lock or system down). In this case, a series of processing programs are reloaded from the magnetic disk device into the RAM, but it takes time to load a huge amount of processing programs, and during that time, sales data is registered in the ECR. Can't do that, waiting for customers until the program is fixed. An object of the present invention is to be able to load only an erroneous portion of a processing program.

[0004]

The means of the present invention are as follows. The external storage device 1 (see the functional block diagram of FIG. 1, the same applies hereinafter) is a magnetic disk device or the like in which various processing programs are stored. The internal memory 2 is a program RAM or the like in which the processing program loaded from the external storage device 1 is stored. The inspection means 3 is the external storage device 1.
The processing program loaded in the internal memory 2 is read for each predetermined unit (for example, for each byte), and it is checked whether the processing program for the predetermined unit is appropriate. In this case, the suitability of the processing program is checked by checksum check or the like. Program restoration means 4 is inspection means 3
When it is detected that the processing program for the predetermined unit is not appropriate, the processing program for the corresponding predetermined unit is loaded from the external storage device 1 to the internal memory 2, and the processing program is restored.

[0005]

The operation of the means of the present invention is as follows. Now, in the ECR, for example, at the end of the day's business (at the time of settlement), the inspection means 3 inspects the processing program in the internal memory 2 loaded from the external storage device 1 for every predetermined unit while checking its suitability. Here, when it is detected that the processing program is not appropriate, the program restoration means 4 loads the processing program corresponding to the predetermined unit from the external storage device 1 to the internal memory 2 and restores the processing program. Therefore, only the erroneous part of the processing program can be loaded.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. FIG. 2 is a system configuration diagram showing a POS (Point of Sales) system. In this POS system, a plurality of slave ECRs 12 are connected to a master ECR 11 via a line. The master ECR 11 loads an application program stored in an external storage device 13 into its own internal memory and also connects each slave ECR 12.
It is transmitted to R12 and loaded into the internal memory in each slave ECR12. As a result, the same processing program is set in each slave ECR 12 in addition to the master ECR 11.

FIG. 3 is a block diagram showing the configuration of each ECR (including the slave ECR 12 in addition to the master ECR 11). Each ECR has the CPU 21 as a core, and C
The PU 21 has an internal memory (program RAM) 22, R
The OM 23 and the gate array 24 are address buses A, respectively.
B, a data bus DB, and a control bus CB are connected, and an input unit 25 and an output unit 26 are also connected. Here, the CPU 21 writes the application program transferred from the external storage device 13 into the program RAM 22. In the program RAM 22, memory areas 22-1, 22-2 corresponding to a plurality of application programs loaded from the external storage device 13,
.. 22-N, the CPU 21 designates an arbitrary application program from the program RAM 22 and executes processing according to the program.

The ROM 23 has a download program memory area 23-1, a RAM program (application program) appropriateness determination memory area 23-2, and another program memory area 23-3. Here, when the checksum check is performed on the application program in the program RAM 22, if the data is garbled, the checksum does not match. Therefore, the download program in the download program memory area 23-1 is activated and externally stored. The program is loaded from the device 13 into the program RAM 22. In this case, the checksum check is performed for each predetermined unit (in this embodiment, for each byte), and a 1-byte program including data whose checksum does not match due to data corruption during download. Only the data is loaded. A checksum check program is stored in the RAM program appropriateness determination memory area 23-2. The gate array 24 has a buffer group such as a flip-flop, and the gate array 24
A checksum for each predetermined unit is latched for each processing program.

Next, the operation of this embodiment will be described. FIG. 4 is a flowchart executed after settlement of a fixed totalizer (not shown). First, the checksum check program in the program appropriateness determination memory area 23-2 is activated to perform a checksum check on various processing programs stored in the program RAM 22 (step A1).

FIG. 5 is a flow chart showing this type of check processing. First, program RAM2
The first memory area 22-1 forming 2 is designated (step B1). Next, the row address and the column address for the designated memory area are cleared (step B2). Then, the gate array 24 is initialized (step B).
3). When such initialization processing is completed, the designated memory area 22-1 in the program RAM 22 is designated by a row address and a column address, 1-byte data is read (step B4), and based on the read 1-byte data. Checksum check is performed (step B5), and if the program data has no error, the process proceeds to the next step B7 to update the address. If the program data has an error, the process proceeds to step B6 and the row address and After the column address is held in the address register (not shown) in the CPU 21, the address is updated (step B7). Then, the process proceeds to step B8, and it is checked whether or not the checksum check is performed up to the end of the processing program stored in the designated memory area of the program RAM 22. If the checksum check is not performed up to the end, the process returns to step B4. The above operation is repeated.

As described above, the processing program stored in the designated memory area in the program RAM 22 is read out byte by byte and a checksum check is performed. As a result, 1 byte data contains error data. If so, the row address and column address of the 1-byte data are stored and held in the address register in the CPU 21.

When the check processing for one memory area in the program RAM 22 is completed, the process proceeds to step A2 in FIG. 5, and as a result of the checksum check, error data is found in the processing program stored in the designated memory area. Whether or not the address is included is checked based on whether or not the row address and the column address are included in the address register in the CPU 21. Here, if the error data is included, the process proceeds to step A3, and the download program memory area 23-1 is designated to start the download program. As a result, the row address and column address held in the address register in the CPU 21 in the above-mentioned check processing are read out, and the corresponding 1-byte data is read from the external storage device 13 into the program RA.
The program is restored by loading it in the designated memory area in M22. Such a program restoration process for each byte is repeated by returning from step A4 to step A3 until execution is completed for all bytes including error data.

When the program restoration processing for the designated memory area in the program RAM 22 is completed in this way, the process advances to step A5 to check whether the designated memory area of the program RAM 22 is the final memory area. If not, the next memory area in the program RAM 22 is designated (step A6). And step A1
Returning to step 1, the checksum check processing is performed on the designated memory area of the program RAM 22, and the above operation is repeated until the final memory area in the program RAM 22 is designated and the checksum check processing for it is completed.

As described above, in this embodiment, a checksum check is performed on various processing programs stored in the program RAM 22 every time the fixed totalizer is settled, and as a result, if there is error data, The program in the external storage device 13 can be restored byte by byte. Here, the master ECR 11 executes the processing program in the external storage device 13 as the slave E indicated by slave No1.
When loading to CR12 and then to other slave ECR12 from this slave ECR12, the master EC
When R11 is loading program data into slave ECR12 indicated by slave No1, slave No.
The slave ECR 12 indicated by 1 is another slave ECR.
However, if the master ECR 11 is searching the external storage device 13, the slave ECR 12 indicated by the slave No. 1 loads the program data to another slave ECR 12 if the master ECR 11 is searching the external storage device 13. By doing so, it becomes possible to efficiently transfer the program data.

In the above embodiment, the checksum check is performed when determining the suitability of the processing program, but the checking method is arbitrary.

[0016]

According to the present invention, it is possible to load only the erroneous portion of the processing program.
It is possible to efficiently restore the processing program.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 is a schematic configuration diagram of a POS system showing an embodiment.

3 is a block diagram showing the main part of each ECR that constitutes the POS system of FIG.

FIG. 4 is a flowchart executed after settlement of a fixed totalizer.

5 is a flowchart detailing the check process shown in FIG.

[Explanation of symbols]

 13 External Storage Device 21 CPU 22 Program RAM 22-1, 22-N Memory Area 23 ROM

Claims (1)

[Claims] 1. A data processing device for processing data in accordance with a processing program in an internal memory loaded from an external storage device, wherein the processing program in the internal memory loaded from the external storage device is read for each predetermined unit. Inspecting means for inspecting whether the processing program for a predetermined unit is proper, and when the inspection program detects that the processing program for the predetermined unit is not proper, A data processing device comprising: a program restoration unit that restores the processing program by loading the external storage device to an internal memory.