The specification of a chip says that a pin is a "Digital Output, CMOS Input Pad".
So that pin is an output pin, meaning that the chip can put a HIGH or a LOW voltage at that pin. What does "CMOS Input Pad" mean here?
In the vicinity of very limited OP information looks like plain dual function input/output port. Usually these can be pulled low or high as inputs, have two or three states as outputs (are we talking AVR?).
Please put some light on that specific chip if You would require more details.
Can you be more specific about the chip? It is hard to answer, otherwise.
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