Sure, this kind of stuff happens all the time. I use this exact technique in
a 16C84 project of mine. It should work fine.

Note that it is often a good idea to make sure you have an R in series with
the button, this limits ESD inrush currents.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

----- Original Message -----
From: brah <brah@ULTRA.NET.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, September 05, 2000 8:36 AM
Subject: [PIC]:Inputs & Outputs


>         I've read the discussions re port registers and latches where care
has
> to be taken, and I've noted the necessities.
>         However, I wonder if it is common, or even regular, to swap a pin
from
> input to output and back again repeatedly every mS or so.  i.e. to have
> a button and a led on the same pin - with resitors to protect the pin
> being shorted to either pos or neg by the button, when it's an output.
>         Sort of multiplexed in-out. This would save a few pins on my
project,
> and maybe get it back from an 877 to an 876.
>         Thoughts on this would be appreciated.
>         Regards to all
>                 Howard.
>
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