| 摘要 |
PURPOSE:To reduce power consumption of the integrated circuit, by stopping the system clock (SCK) and the basic clock (CK) when the data processing is not executed and by shortening the time of the transition state of the C-MOS constitution. CONSTITUTION:During the data processing, CK oscillating circuit 1 oscillates to supply basic CK11 to SCK generating circuit 2. Circuit 2 frequency-divides CK11 to supply SCK12 to data processing device 5. Device 5 executes various data processings synchronously with SCK12. During this time, power consumption based on the transition state of the C-MOS constitution in device 5 is increased in proportion to the frequency of SCK12. When device has nothing to execute, hold signal 15 is sent to CK control circuit 3. Circuit 3 receives signal 15 and sends oscillation stop signal 13 and SCK supply signal 14 to circuits 1 and 2 respectively to stop supplying of CK11 and SCK12. The operation state of the circuit is not changed, and device 5 becomes stable, and C-MOS has only a leak current, thus power consumption is reduced. |
