Did you set the fuse to disable low voltage programming?

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