| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to change the contents of a program and to improve the efficiency of program development by switching a program memory switching means when the contents of a read-only program memory are changed. SOLUTION: A rewritable program memory 3 having capacity more than that of a read-only program memory 2 is connected to the memory 2 in parallel. A program memory switch 9 switches these two program memories 2, 3. When the switch 9 is selected to the side of the memory 2, an MPU 1 previously transfers the contents of a program from the memory 2 to the memory 3 and executes the program. When the switch 9 is selected to the side of the memory 3, the contents of the memory 3 are changed from the external.
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