PURPOSE: To change the contents of a program even when a CPU is operated in a program controlling system, by directly inputting an input from an external system into the program.
CONSTITUTION: A CPU1 executes processing operations in accordance with programs stored in an ROM2 and register group 3. The contents of the programs stored in the register group 3 is rewritten by an external logic circuit 5 irrespectively of the operation of the CPU1. Therefore, the content of a program can be changed without interrupting a main process when a processing contents is to be changed. That is to say, when a processing contents is to be determined by judging various conditions, the contents of a program can be changed directly by judging various conditions by means of a hard logic circuit or another CPU system. Therefore, the direction of a process can be changed by changing the contents of the program without interrupting a main process at the CPU1.
OGAWA YASUNORI
TANAKA YASUO
SHIMOZONO RIYOUJI
