| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce power consumption by turning into a waiting state, and to reduce power consumption even in a normal operation. SOLUTION: This circuit is provided with an oscillation amplitude level detecting circuit 3 for monitoring the amplitude level of an oscillation signal e being a clock signal supplied from an oscillation circuit 4 which operates with an operating voltage d, and for outputting a boosting signal c when the deterioration of an amplitude level E due to the decrease of the operating voltage d is made not more than a preliminarily set lower limit level G and a voltage variation regulator 4 for controlling the operating voltage d according to the supply of the boosting signal c. Thus, the operating voltage d is reduced to almost a limit with which a stable operation can be ensured by a system logic 5 in a normal operation so that the power consumption can be reduced even in the normal operation.</p> |
