| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a key input circuit, a device and a method for controlling power supply, with which a hardware quantity can be suppressed and a software processing sequence for detecting keying can be simplified. SOLUTION: A power supply control key SW11 is provided on a key switch 102, formed by locating plural key contacts SW11, SW12, SW21, SW22, etc., at the crossings of a key matrix and a key scan circuit 101 for detecting the pressing/releasing state of plural key contacts on the key switch 102 is provided, independently of a power supply control key state detecting part for detecting the opening/closing state of the contact SW11 of a power supply control key, and when a power source is turned on, pressing of the power supply control key SW11 is detected by the power supply control key state detecting part, but when operation is finished or power source is turned off, depressing of that key is detected by the key scan circuit 101, so that supply/stop of power can be controlled.</p> |
