Start-stop synchronization serial communication circuit and semiconductor integrated circuit having start-stop synchronization serial communication circuit

摘要

When detecting a start bit, a start bit detection circuit 15 a outputs a signal for starting the oscillating operation of a clock signal generation circuit 16. When latching an end code for indicating the end of serial communication, a latch circuit 21 outputs the end code to a decoder 26. The decoder 26 decodes the end code and outputs a signal for stopping the oscillating operation of the clock signal generation circuit 16. Thus, the power consumption of the clock signal generation circuit 16 can be reduced.