David Duffy wrote:

> I've done a dozen or so F628 projects so far. CMCON bit me too!
> Regards...


Thank you David and everyone else who helped.
I found the "bug" but not real happy about what it
was... I have put the code below.

----------------------------------------------
This code DOES NOT work, sympoms are same as CMCON not
set properly:

        IFDEF  __16F628

                banksel 0               ;
                movlw b'00000111'       ; disable comparators
                movwf CMCON             ;

                clrf T1CON              ; disable timer1
                clrf T2CON              ; disable timer2
                clrf CCP1CON            ; disable CCP module

                banksel 1               ; do bank 1 stuff
                clrf VRCON              ; disable Vref
                clrf PIE1               ; disable pi etc
                banksel 0               ;
        ENDIF

----------------------------------------------
This code works!!!

        IFDEF  __16F628

                banksel 0               ;
                clrf T1CON              ; disable timer1
                clrf T2CON              ; disable timer2
                clrf CCP1CON            ; disable CCP module

                banksel 1               ; do bank 1 stuff
                clrf VRCON              ; disable Vref
                clrf PIE1               ; disable pi etc
                banksel 0               ;

                movlw b'00000111'       ; disable comparators
                movwf CMCON             ;
        ENDIF
----------------------------------------------

I fiddled with it a bit, and it only seems to do the
"movwf CMCON" if it occurs AFTER the VRCON/PIE pair!!!!

Is there a known F628 bug where CMCON has to be done
AFTER clearing VRCON or PIE1 registers?? Or is this
some freaky MPASM fault with the IFDEF directives??

Or am I so completely stupid that I have no idea what
i've done wrong?? :o)
-Roman

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