INNER CLOCK SYNCHRONIZING METHOD/CIRCUIT

摘要

PROBLEM TO BE SOLVED: To immediately synchronize an inner clock by means of the sampling of a phase comparison result by using the edge of a source oscillation clock. SOLUTION: A clock comparison means 11 compares the inner clock SCK 2 generated by frequency-dividing the source oscillation clock Xin by a clock generation means 10 with an inputted reference clock SCK1. A comparison result signal COMP which the clock comparison means 11 outputs is held in a comparison result holding means 12 in synchronizing with the source oscillation clock. The input of the source oscillation clock to a clock generation moans 10 is opened/closed by a clock opening/closing means 13 controlled by a comparison result signal/COMPD held by the comparison result holding means 12.