button pullup/down resistor?

[davewanna]

I have been working for days on an RF project, and I suspect I'm going crazy.

I have put a button on my 16F877a just so I can tell it to do something.
The problem is, that when I press the button it activates, but when I let go of it, it stays activated.

I have gone as low as a 560ohm pullup/down resistor. Tried pulling to ground, and to +5V.

I am currently using pin D.0

TRISD = %10000000
but  VAR PORTD.0
....

Start:

lcdout $fe,$80,"Rec  ",dec counter
lcdout $fe,$c0,bin result,"   "
lcdout $fe,$d4,bin stats,"   "

if but = 1 then
  lcdout $fe,$8A,"B"
  gosub chkstatus
else
  lcdout $fe,$8A," "
endif

if nIRQ = 0 then
  lcdout $fe,$94,"Receiving!"
  gosub receive
else
  lcdout $fe,$94,"Waiting..."
endif

pause 50
counter = counter + 1

goto start

With a 560ohm to +5v, and the button to ground. After it has been pressed, and depressed - I am still measuring 185mV on pin D.0. Even after I remove the jump wire to the button entirely, I am still reading 185mV on the pic with only the resistor connected to +5v.


HOWEVER... If I take the jump wire from pin D.0 and connect it straight to +5v, and then to ground. The display and functions work as expected.

How could I have done this? I have tried 2 different (new) 877a's, and several port pins.

Running on 10MHz, 5V regulated, smoothing caps, on a breadboard.