| 摘要 |
PROBLEM TO BE SOLVED: To provide a system operation monitoring circuit capable of allowing flexibility to a system design and of enabling application to the case that safety is strongly required. SOLUTION: The system is provided with A WDT (watch dog timer) counter 12 which is variable and for monitoring a normal operation of a system mounting CPU 1 including system software and can set a time voluntarily until system abnormality is detected. Also, the system is equipped with the circuit with a clock stop detection circuit for monitoring a clock for the WDT counter 12 operation, thereby generating interruption to the CPU 1 by clock stop detection and outputting an emergency stop-signal. COPYRIGHT: (C)2004,JPO
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