I don't know the 'F84. But I had an identical problem on a 16F870, when
using pin RC0. It was multiplexed with Timer 1 clock output; and this was
completely screwing everything up.

Check the datasheet for other peripherals or featured multiplexed on that
pin, and turn them off as necessary.

Jon

> -----Original Message-----
> From: Stuart Meier [mailto:stuartmeier@RYG1.FREESERVE.CO.UK]
> Sent: 10 December 2003 16:04
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC] Input pin at 1.55volts....
>
>
> Just come back to PICs after a very long break. Just updating
> an old project, on a 16F84. Very simple, just flashes LEDs etc.
>
> Now changed rb6 and rb7 to inputs to read a pair of simple
> switches, which are pulled low by 10K res, then switch pulls
> them high.
>
> I've set to inputs like this....
>
> move to bank 1
>     movlw    b'11000000'
>     movwf    TRISB
> return to bank0
> etc
>
> then read them as
>     btfsc    portb,6
> etc
>
> but when run PIC does not recognise state of RB6 and RB7 -a
> simple voltmeter check on them gives approx 1.55 volts when
> they are not pulled high by input switch.
>
> Can anyone suggest what is causing this? I think it is
> something simple and I'll kick myself when I realise....
>
> Stuart
>
> --
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>

--
http://www.piclist.com hint: The PICList is archived three different
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