| 摘要 |
<p>PURPOSE:To prevent an unnecessary current from flowing by providing each peripheral device with a frequency divider and a clock selecting means of the fundametal clock which controls the peripheral function. CONSTITUTION:A CPU 101 to which a clock phi is inputted, a frequency divider 1021 to which the clock phi is inputted, a clock selecting means 1031 to which the output of the frequency divider 1021 is inputted, and a peripheral device 1041 to which the output of the means 1031 is inputted are provided. Further, frequency dividers 102N (N=2,3...) to which the clock phi is inputted, clock selecting means 103N to which outputs of frequency dividers 102N are inputted, and peripheral devices 104N to which outputs of clock selecting means 103N are inputted are provided. The clock 4 is inputted to the CPU 101, and required clock frequencies are selected from the clock, which has the frequency divided by frequency dividers 102N, by clock selecting means 103N and are inputted to peripheral devices 104N. An arbitrary clock is inputted to the peripheral device whose processing speed is not high, and an unnecessary current does not flow.</p> |
