| 摘要 |
A signal-selecting circuit applicable to low-active and high-active electronic circuits has a pull-up circuit and a pull-down circuit with one end of each connected to an input port. The pull-up circuit includes a first resistor and a first switch circuit connected serially. The remaining end of the pull-up circuit is connected to a power source. The pull-down circuit includes a second resistor and a second switch circuit connected serially. The remaining end of the pull-down circuit is connected to ground. The first switch circuit and second switch circuit are connected to a selecting part. The selecting part turns on-either the first switch circuit or the second switch circuit to fix the potential of the input port at a High state or a Low state according to an input selecting signal.
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