| 摘要 |
PURPOSE:To escape exactly from an infinite loop, even in case of a double fault which will fall into the infinite loop by a fault processing program, by informing an interruption of the fault processing program first, when the infinite loop of a system is detected. CONSTITUTION:A processor 1, a memory 3, and a system monitor timer 2 are connected through a processor bus 4, and usually the processor 1 resets the system monitor timer by a prescribed period being smaller than the time when the system monitor timer 2 overflows, by executing a program which is stored in the memory 3. If a system gets into an infinite loop due to a bug of the program, the system monitor timer 2 cannot be reset within a prescribed period, therefore, the system monitor timer 3 overflows. If the number of times of the overflow is less than a prescribed number of times, the system monitor timer 2 sends out an interrupting signal 6 to the processor, and when said number of times exceeds the prescribed number of times, the timer sends out an initializing signal 5 to the processor 1.
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