Patent ID: 6269032
Filing Date: 2001-07-31
Classification: G11C

Abstract:
An electronic control unit comprising:a power supply source for supplying a power supply voltage;a memory for storing data;a voltage detecting circuit for outputting a voltage-drop signal indicating fall of the power supply voltage;a CPU for controlling a write operation of data to the memory based on the power supply voltage; anda signal output circuit for outputting, to the memory, a signal indicating an inhibition of data write operation after elapse of time from an input of the voltage-drop signal from the voltage detecting circuit, the time being determined to complete the write operation of data divided for each data having at least concurrency,wherein the CPU permits a start of the write operation to the memory to execute the write operation of data for each data that requires concurrency when a signal output from the voltage-drop detecting circuit is other than the voltage-drop signal and a signal output from the signal output circuit indicates a permission of data write operation.