| 摘要 |
<p>PURPOSE:To prevent the malfunctions of a device and a system in which a microprocessor is used by continuing a resetting signal covering the period when power source voltage becomes lower temporarily than specified voltage. CONSTITUTION:A power source voltage monitoring circuit 110 supervises power source voltage 1 of a microprocessor 200 and an alarm signal 2 is sent out from the circuit 110 to a resetting signal generating circuit 120. When power source voltage is lower than a specified value, the signal 2 becomes low level. Clock signals 3 having continuous specified time interval are sent out from a clock circuit 120a of the circuit 120. A resetting signal 4 is generated in the circuit 120b making the signal 3 a base and sent to the microprocessor 200. The signal 4 is sent while the signal 2 is low level and for a specified time from the point of time when the signal 2 changes from low level to high level.</p> |
