| 摘要 |
<p>PURPOSE:To eliminate the need for a CR time constant circuit element which is used conventionally by placing a gate in a mode setting state corresponding to the supply of a reset signal and putting it in normal operation with a signal from an input/output terminal at the end of the supply. CONSTITUTION:An input/output port terminal P10 of a one-chip microcomputer 1 is held at a low level in normal operation and the gate signal to a terminal S of the gate 2 is at a high level, so that the gate 2 is placed in normal operation. When the reset signal is supplied, the input/output port terminal P10 is held at the high level and the gate signal to the terminal S of the gate 2 goes down to the low level, so that signals X, Y, and Z of input/output port terminals P20, P21, and P22 have signal level of signals X0, Y0, and Z0. When the reset signal is supplied, the input/output pore terminal P10 is held at the high level by the program of the one-chip microcomputer, so that the computer enters the normal operation state.</p> |
