| 摘要 |
PURPOSE:To quickly restore a state to a normal operation by using a signal from an abnormal operation detecting means so as to clear a ring counter circuit, thereby restoring the state to an initial state when it is detected that the outputs of a prescribed number of flip-flops are in a definite state respectively. CONSTITUTION:The abnormal operation detecting means 8 is added to the ring counter circuit 7 where flip-flops are connected as a ring. If the ring counter circuit 7 is abnormal, the output of the flip-flops of a prescribed number reach a predetermined state, but since they are not in such a state at the normal operation, it is detected by the abnormal operation detecting means 8 to clear the ring circuit 7. Thus, the restoration time is decreased and the expansion of circuit scale is improved. |
