| 摘要 |
<p>PURPOSE:To reset a microcomputer without providing any exclusively used reset line, by sending reset signals by utilizing a voltage supplying line which is used for operating each circuit on a keyboard side. CONSTITUTION:The voltage limiting circuit 4 of a host computer HC changes forcingly a DC voltage Ek supplied to a keyboard KB side in accordance with reset controlling signals. A voltage monitoring circuit 10 inputs the DC voltage Ek supplied from the host computer HC side and impresses a reset signal of a prescribed time width upon the reset terminal of a microcomputer 7 by detecting the change of the DC voltage Ek.</p> |
