ON-VEHICLE ELECTRIC ACCESSORY EQUIPMENT MOUNTED WITH MICROCOMPUTER

摘要

PROBLEM TO BE SOLVED: To eliminate the need to use dedicated hardware and to actualize a reduce number of components, easy assembly, and low manufacture cost by providing a 1st means which restarts controlling on-vehicle electric accessory equipment after initializing a RAM including power source momentary break check information. SOLUTION: When the degree of a voltage drop is relatively large, sufficient voltage compensation can not be performed and a dropped voltage is outputted from a regulator part 7 and supplied to a microcomputer 1 (CPU 2, RAM 3, and ROM 4), a reset circuit 8, etc. From the drop of the source voltage, the CPU 2 investigates and detects whether or not power source momentary break check information stored previously in the RAM 3 is left as it is. On deciding that information showing operation conditions is ceased or varied through the investigation and detection, the CPU 2 initializes the storage area of the information showing the operation conditions in the RAM 3 and restarts controlling the control part 6.