Recognition of inappropriate CPUs by time-lapse pulses and counting of significant steps performed

摘要

In a CPU monitoring apparatus, a lap time pulse, which is generated by the CPU in response to successive executions of a program, is monitored and determined whether its duration is between maximum and minimum values, or longer than the maximum value or shorter than the minimum value, and a program execution alarm signal is generated when the duration is either determined to be longer than the maximum value or shorter than the minimum value. The apparatus further determines whether the CPU has successfully or unsuccessfully executed a predetermined number of significant steps when the CPU has repeatedly executed the program a predetermined number of times, and generates a step execution alarm signal if the CPU is determined as having unsuccessfully executed the predetermined number of significant steps. IMAGE