| 摘要 |
PURPOSE:To enhance efficiency of working ratio of a computer system by temporarily holding the external output information regarding an abnormality occurring after a fixed period as a chance abnormality since a reset signal is received, restarting and permitting the output of the external output information after fixed period. CONSTITUTION:An abnormal signal c is inputted in a CPU 3, the CPU 3 outputs an output holding signal temporarily to an output holding device 5 for abnormal input processing and compares the counted value counted till an abnormal signal occurs afterwards with the preliminarily set setting values for the abnor mal processing. When the counted value counted by this timer counter is less than the setting value, CPU 3 decides abnormal and stops CPU 3 by masking all interruptions. When the counted value counted by the timer counter is more than the setting value, the CPU 3 decides a chance failure and outputs an restarting signal. Furthermore, for interruption processing, the CPU 3 decides the elapse of the fixed period and resets a holding signal to the output holding device 5. Thus, fail-safe function is strengthened and working ratio of the CPU is improved. |
