RESET CIRCUIT OF ELECTRONIC APPARATUS

摘要

PURPOSE: The reset circuit resets a microcomputer(100) so that the microcomputer operates normally when a latch up phenomenon occurs to the microcomputer by an abnormal voltage generated at the secondary output port of a flyback transformer(FBT) or by a noise from the external environment. CONSTITUTION: The circuit comprises: the microcomputer which outputs the voltage fed back from the secondary output port of the flyback transformer and controls the whole system; an abnormality detection part(110) whose output voltage becomes zero if the voltage from the microcomputer is larger than a reference voltage; and a reset circuit part(120) resetting the microcomputer by making the voltage of a reset port(Reset) of the microcomputer from a low level to a high level.