| 摘要 |
PROBLEM TO BE SOLVED: To provide a clock supply circuit which can supply clocks of different frequencies to respective processing circuits only by using an external oscillator of a low frequency and in which a circuit configuration can be simplified and low power consumption can be realized. SOLUTION: A multiplication circuit 120 multiplies a reference clock RCK and generates a multiplication clock signal CLK, a clock for reception generation circuit 130 performs frequency division of the multiplication clock signal CLK with a prescribed frequency division ratio and generates a clock signal CK1 having a desired constant frequency, a clock for DSP generation circuit 132 can supply the clock signal CK1 in which synchronization with a received signal is maintained and a clock signal CK2 whose frequency is variably controlled in accordance with a processing load, because the clock signal CK2 whose frequency can be varied in accordance with the processing load of a DSP with a frequency division ratio set in accordance with the decision results of a load decision circuit 210. |
