On Tue, Dec 25, 2001 at 01:31:37PM -0500, John Hansen wrote:
> Did you set the fuse to disable low voltage programming?

The LVP pin is RB4 on the part. Something else is going on.

BAJ

>
> John
>
>
> At 10:57 AM 12/25/01 +0000, David J Binnington wrote:
> >Hi all,
> >
> >Yes I know it's Christmas day and I am a very sad person but I have had some
> >16F628 code on my mind and just had to sneek away and test it during a lull
> >in the festivities.  I only have the MPLAB simulator to play with as the
> >hardware is not accessible at the moment.
> >
> >I am using MPLAB V5.4.  The problem is that I can't get RB3 to work as an
> >input with either asynchronous stimulus or a stimulus file.  All other bits
> >work OK and RB3 works with the same portion of code on the 16F84 simulator.
> >I know RB3 is shared with the Comparator and CCP modules but they are
> >switched off.  I suspect (and hope) that the simulator is broken for this
> >pin.
> >
> >Am I missing something obvious?  Any other sad PIC people out there care to
> >respond?  ;-)
> >
> >David
> >
> >PS - Here is some barebone code just to prove the point.  Run in animate
> >mode and toggle PORTB pins individually and check the result in TEST. RB3
> >refuses to change. (sorry if the formatting gets lost):-
> >
> >         INCLUDE "P16F628.inc"
> >
> >         org     H'00'                           ;Reset vector
> >         goto    init                            ;
> >         org     H'04'                           ;Interrupt vector. ISR
> > not used here
> >
> >init
> >
> >TEST    EQU     H'20'                           ;Define test register location
> >
> >         movlw   H'07'                           ;
> >         movwf   CMCON                           ;Set for Digital inputs,
> > disable analog comparator
> >         clrf    CCP1CON                 ;Turn CCP module off (should be
> > off by default anyway)
> >
> >         bsf     STATUS,RP0                      ;Set BANK 1
> >         movlw   H'FF'                           ;
> >         movwf   TRISB                           ;Set PORT B for all I/P
> >         bcf     STATUS,RP0                      ;Set BANK 0
> >
> >         clrf    PORTB                           ;Clear PORTB output
> > latches. Don't really need to do this
> >
> >loop
> >         movfw   PORTB                           ;Read PORTB and
> >         movwf   TEST                            ;copy to TEST
> >         goto    loop                            ;Repeat forever
> >
> >         end
> >
> >--
> >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
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>

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