| 摘要 |
PROBLEM TO BE SOLVED: To easily perform rewrite operation in a short time without rewriting data in all data areas when changing a version by providing the leading address of a data memory with a version information area for writing version information. SOLUTION: A data memory 1 is provided with an address information area 3 writing respective address information in respective data areas 2a-2c. Further, the leading address of the data memory 1 is provided with a version information area 4 for writing the version information. By reading the version information in the version information area 4 of the data memory 1 through a program memory, the current version of the data memory 1 can be recognized. Therefore, even when the version is changed, the address of the data area of the data memory 1 can be recognized and corresponding to the version of the data memory 1, read operation can be properly performed.
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