al smith wrote :

> 16F877 is the device.  I found the problem, but still is a little
> perplexing.  The wire for the pup voltage had popped loose,
> so the port pin (happened to be A4) was floating.  That explains why the
> output wasn't going high, but the register wasn't holding the bit set, but now
> that it is pulled up, the PORTA register shows it set.
>
> I would have expected
> the bit to show high, even if the output was floating.

Why would it read a high ?
There was nothing pulling the pin high, was there  ?

Jan-Erik.

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu