CURRENT CONSUMPTION REDUCING CIRCUIT FOR STANDBY STATE OF EQUIPMENT WITH INSTALLED MICROCOMPUTER

摘要

PROBLEM TO BE SOLVED: To reduce current consumption in a standby state concerning the microcomputer part of a television receiver. SOLUTION: For example, a CPU 27 stops operation by supplying a signal '1' to a key entry interrupt selecting register 25 so as to select the input terminal B of a selector 21. When any one key in a key matrix group 11 is pressed, the analog voltage value thereof is supplied through one of A/D converting input terminals 13a-13d to an A/D converter 15 and one of buffers 17a-17d. When the analog voltage value is smaller than a threshold, a low level signal from an AND circuit 19 is supplied via the selector 21 to an interrupt control means 29, so that a constitution is such that a standby mode cancel request signal is generated and the CPU 27 to restore into the active state.