Patent ID: 6882193

Claim:
A power on/off reset circuit comprising: a first voltage detection circuit which detects a power supply reaching a first voltage and outputs a first signal, a second voltage detection circuit which detects the power supply reaching a second voltage higher than the first voltage and outputs a second signal, a third voltage detection circuit which receives the first and second signals and outputs a third signal, and a first circuit which has a first function of executing a series of operational sequences in accordance with an input control signal and a second function of not accepting said input control signal, wherein the third signal is transmitted as the second signal when the power-supply voltage rises, and transmitted as the first signal when the power-supply voltage drops, and the first function of the first circuit continues an ongoing sequence according to the input control signal and the second function of said first circuit prevents a new operational sequence regardless of the input control signal when a power-supply voltage is equal to or lower than a voltage for the third signal transmitted.