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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