| 摘要 |
<p>PURPOSE:To make it possible to release auto-power off, where power is turned off after a fixed time, without influence of malfunctions even if the power source switch is turned on in a desk calculator, etc. CONSTITUTION:If another key is depressed when specific key 2 of keyboard part 1 is depressed, the output of plural-key simultaneous depression discrimination part 9 becomes H, and the output of AND gate 11 becomes L through inverter 11, and therefore, FF6 is not reset, and auto-power off is not released even if specific key 2 above is depressed. Then, when the specific key is depressed singly, the output of discrimination part 9 and the output of AND gate 11 through inverter 10 become L and H respectively, and FF6 is reset, and the auto-power off state is released by normal clocks from clock generator 7, thus performing this operation without error.</p> |
