Pulse frequency control circuit, microcomputer, DCDC converter, and pulse frequency control method

摘要

The pulse frequency control circuit (1) includes a selection circuit (12) that acquires and selects a plurality of reference clocks having the same reference period and different phases, and a set period in units of a first period shorter than the reference period. Based on the setting register (13) for storing the information to be specified and the information stored in the setting register (13), the setting circuit (12) is configured to select the setting from the rising edges of the plurality of reference clocks. And a control circuit (15) that sequentially and repeatedly selects rising edges rising at periodic intervals as rising determination edges, and the selection circuit (12) sequentially and repeatedly generates output pulses that rise at every timing of the rising determination edge to be selected. As a result, an output pulse train composed of the output pulses is output.