| 摘要 |
PURPOSE:To raise the stand-by time rate of a CPU, and to decrease the current consumption by always monitoring the stand-by time rate of the CPU, and applying the reset or interruption to the CPU, when this stand-by time rate has exceeded a prescribed range. CONSTITUTION:A supervisor/resetting circuit 6 always monitors the time rate of a HALT signal of a CPU 7, and when the time rate of the HALT signal exceeds a prescribed range which has been determined in advance, it is regarded as an abnormal state, and an ALM signal is outputted to the CPU 7. This circuit is constituted of an AND gate 12 so that AND of the ALM signal and a power-on reset signal (PS RESET signal) at the time when a power source has been turned on is inputted. In this way, when the ALM signal becomes active, the reset is applied to the CPU 7. |
