| 摘要 |
<p>PURPOSE:To prevent increase of a power supply current, the rise of the LSI temperature, the occurrence of a latch-up state, etc., by switching an external clock if stopped to the output of an oscillation circuit incorporated previously. CONSTITUTION:An external clock is supplied to a clock control circuit via an external clock input terminal 1 and then supplied to an external clock stop- start detecting circuit 2. Then the output of an internal oscillation circuit 6 and the external clock are supplied to a switch circuit 5 respectively and switched with each other by the output of the circuit 2. Thus the output of the circuit 6 incorporated previously functions to drive an internal gate of an LSI in case the clock supplied from the outside of the LSI is stopped. Thus the mischarging of a dynamic circuit is avoided and therefore the increase of a power supply current, the rise of the LSI temperature, the occurrence of a latch-up state, etc., can be prevented.</p> |
