Clock generation device, electronic apparatus, moving object, and clock generation method

摘要

A clock generation device measures a frequency ratio between a clock signal CK1 (32.768 kHz+α) and a reference frequency value based on a clock signal CK3 (25 MHz), generates a clock signal CK2 obtained by masking at least one clock pulse of the clock signal CK1 based on the measurement result of the frequency ratio, and controls the measurement interval of the frequency ratio based on the difference between the measurement result of the frequency ratio and an average value of N (N is a natural number) measurement results of the frequency ratio.

主权项

1. A clock generation device adapted to
measure a frequency ratio between a first clock signal and a reference frequency value based on a third clock signal, generate a second clock signal obtained by masking at least one clock pulse of the first clock signal based on the measurement result of the frequency ratio, and update a compensation value of a frequency-temperature characteristic of the third clock signal in a case in which a difference between the measurement result of the frequency ratio and an average value of N (N is a natural number) measurement results of the frequency ratio is larger than a first reference value.