Pulse-frequency control circuit, microcomputer, DC-to-DC converter, and pulse-frequency control method

摘要

A pulse-frequency control circuit includes: a selection circuit that receives, and selects from among, a plurality of reference clocks whose phases differ from one another and which have a same reference period; a setting register that stores information for identifying a setting period that is in increments of a first duration shorter than the reference period; and a control circuit that causes, based on the information stored in the setting register, the selection circuit to sequentially and repeatedly select, as a determined rising edge, a rising edge occurring at intervals of the setting period from among rising edges of the plurality of reference clocks, in which the selection circuit sequentially and repeatedly generates an output pulse whose rising edge coincides with the determined rising edge selected, to provide an output pulse sequence of the output pulses.