| 摘要 |
<p>PURPOSE:To shorten the waiting time when the output of an oscillation circuit is continuously supplied as a clock to a microprocessor at the start of oscillation until the output of the oscillation circuit is stabilized. CONSTITUTION:A clock generating circuit is provided with a 1st buffer circuit 2 which uses the output of an oscillation circuit 1 as its input and has the large hysteresis width, a 2nd buffer circuit 3 which uses the output of the circuit 1 as its input and has the small hystereis width, and a timer circuit 4 which uses the output of the circuit 2 as its count input. Then the output of the circuit 1 acquired through the circuit 3 is supplied to a microprocessor 7 via an AND circuit 6 when an overflow signal of the circuit 4 is produced.</p> |
