| 摘要 |
<p>PURPOSE:To constitute a stable and inexpensive sequence circuit by using a delay circuit consisting of a resistor and a capacitor and a circuit consisting of an inverter IC to constitute the sequence circuit. CONSTITUTION:A constant circuit 1 converts the voltage of battery into 5V constant voltage and supplies the constant voltage to a microcomputer 3 and the sequence circuit 2 outputs signals to the inverse of RES terminal for resetting the microcomputer 3, the inverse of NMI terminal for executing interruption processing and the inverse of STBY terminal for reducing current consumption. After disconnecting an ignition switch 8, a constant voltage circuit 5 outputs small power to the microcomputer 3 and an I/O interface 4 outputs/inputs signals to/from the external through a terminal 7. Since it is unnecessary to use four expensive one-shot multivibrator ICs, the cost of the circuit can be reduced down to about 1/3, the since malfunction due to surge is not generated, a highly reliable circuit constitution can be obtained.</p> |
