Tim,

 Disregard my previous email.  I was thinking of RA4 which is open drain.
 RA2 ids the VREF- pin when using AD converters.  This pin might power up
 in analog mode.  Have you changed porta to digital I/O?  This may be the
 problem.




> Looking in the 16F877 Data Sheet, I don't see any internal pull-up
> resistors on any ports except port B has a weak pull-up.
>
> Does this mean that I have to add external pull-up resistors to get +5V
> on Port A pins?
>
> When I connect my scope to PortA,2 which should show a pulse signal, I
> see the signal resting at Gnd.
> When I add a 2.2k Ohm resistor from PortA,2 to Vcc, I see my +5V to Gnd
> swing.
>
> This is disturbing...
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.