DETECTING AND RECOVERY CIRCUIT FOR POWER SUPPLY BREAK

摘要

PURPOSE:To release a reset state automatically by providing a reset resetting means which release the reset state of a microcomputer automatically after the microcomputer is reset when a source voltage recovers. CONSTITUTION:When a power source VB1 falls below a specific value VH owing to a break of the source voltage, a CPU 7 performs necessary processing and resetting processing is securely performed after the necessary processing, so the CPU 7 is not held in a HALT state and when the CPU 7 is restarted, normal operation is performed. Further, even when the source voltage V1 recovers, the necessary processing is finished by the CPU 7 the CPU is reset after the processing and the reset state is reset automatically. Consequently, when the source voltage recovers after the resetting and the CPU is surely put in operation.