the restoration of cpu due to malfunction of a system or when the cpu is in an abnormal state.

摘要

A circuit for resetting a system controller includes a level detector and a watch-dog circuit. The level detector compares a first reference voltage with a supply voltage provided to the system, and provides output of a first reset signal indicating that the controller is in an abnormal state in dependence upon the comparison between the first reference voltage and the supply voltage. The watch-dog circuit compares a second reference voltage with a voltage exhibited by the first reset signal, and provides output of a second reset signal to the controller to reset the controller in dependence upon the comparison between the second reference voltage and the voltage exhibited by the first reset signal. A connector provides the first reset signal from the level detector to the watch-dog circuit.