START-STOP SYNCHRONIZATION SERIAL COMMUNICATION CIRCUIT AND SEMICONDUCTOR INTEGRATED CIRCUIT HAVING START-STOP SYNCHRONIZATION SERIAL COMMUNICATION CIRCUIT

摘要

Upon detection of a start bit, a start bit detection circuit (15a) outputs a signal which starts the oscillation operation of a clock signal generation circuit (16). When a latch circuit (21) latches an end code indicating the end of serial communication, it outputs the end code to a decoder (26). The decoder (26) decodes the end code and outputs a signal which stops the oscillation operation of the clock signal generation circuit (16). Thus, it is possible to reduce power consumption of the clock signal generation circuit (16).