| 摘要 |
<p>PURPOSE:To simplify operation by selecting the state of stoppage and operation of automatic power-off function by operation of a key switch. CONSTITUTION:When power source is made on, a power-on clear circuit 24 outputs low level and the output of a latch circuit 28 is set to low level, and power source is supplied to an internal circuit 34 from a power source circuit 33. If no key input is made from a key processing block 23 until lapse of a specified time, a high level is outputted from a counter circuit 31, power source of an internal power source circuit 34 is cut off and becomes the state of automatic power-off. To apply power source again from the state of automatic power-off, it is enough to turn an on-key 21 on. When automatic power-off function is not necessary, an automatic power-off stop key 40 is made on.</p> |
