You can use it as an output, but it only outputs low (not as useful,
eh?)

A common use is to tie it high with a pull-up resister.  When you send a
1 to it, it basicly leaves the pin floating, and the pull-up resister
brings the line high.  When you send a 0 it pulls the pin low.

-Adam

Edson Brusque wrote:
>
> Hello,
>
> > PortA.4 is open collector output. That means that it can only tie the pin
> to
> > ground. It doesnt have the bit to connect it to Vcc like the other pins
> do.
>
> This means I cannot use it as output? What can I do with it then (besides
> input)?
>
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