| 摘要 |
<p>PURPOSE:To make a program effective by performing resetting operation without inserting any extra instruction into the program. CONSTITUTION:The instruction in an execution address specified by the program counter 3 of a CPU 1 is sent from a program memory 4, decoded by an instruction decoder 2 and executed by the CPU 1. At this time, the value of a setting circuit 7 where the specific value is set previously is compared with the value of the program counter 3 by a comparing circuit 6 and when the comparison result indicates an equality, it is judged that the microcomputer is in normal operation, so that the normal microcomputer is reset through a timer 5. When the microcomputer malfunctions and the value set in the setting circuit 7 does not equal to the value of the program counter 3 within the operation time of the timer 5, on the other hand, the malfunction of the microcomputer is judged and the timer 5 operates to send a specific signal to the CPU 1, thereby initializing the microcomputer.</p> |
