CLOCK CONTROL CIRCUIT FOR TIMER REGISTER

摘要

PROBLEM TO BE SOLVED: To provide a driving circuit for a timer register capable of executing similar operation before and after changing a bus clock without correcting a program even when the bus clock is changed. SOLUTION: The clock control circuit is constituted of a timer register for executing counting operation at a prescribed period, a control register 1 for setting up the counting period of the register 3 and outputting a set signal for setting up the counting period and a PLL circuit 2 for inputting a bus clock and generating a clock signal by dividing or multiplaying the bus clock on the basis of the set signal outputted from the register 1. The register 3 executes counting operation at the counting period synchronized with the clock signal outputted from the PLL circuit 2.