| 摘要 |
PROBLEM TO BE SOLVED: To provide an electronic equipment device equipped with an output data retention function which, even if a microprocessor controlling operation of an external device by generating a control signal is reset, is capable of retaining the control signal that has been generated by the microprocessor before being reset and maintaining the operation of the external device.SOLUTION: An electronic equipment device includes a latch circuit which latches a control signal generated by a microprocessor and feeds the same to an external device. A first input/output port P1 of the microprocessor is pulled down via a resistor to maintain a latch enable terminal LE at Low level during initial processing of the microprocessor associated with resetting thereof. Also, a second input/output port P2 of the microprocessor is pulled up using a resistor, while an output of the latch circuit, which is kept at Low level all the time in association with latch operation, is fed to an output enable terminal OE of the latch circuit via a diode to keep the output enable terminal OE at Low level during the initial processing. |
