I was wondering if some one could help me in figuring out how to compare two
numbers and either add one or subtract one on the pic16c72.

In the varable V there is a constant 100
The ADC is read in to W and V needs to be compared with the value
In the varable D is stored the result of the system, initilized to 100, this
is either added to or subtracted to.

I have tried this but it all it does is give me 50% duty cycle out.

            MOVF    ADRES,W        ; Get A/D value
           SUBWF V,W                     ; Test it
            SKPNC                           ; Positive?
            GOTO POS                     ; Yes goto add
            MOVLW 0x01                 ; No setup for subtract
            SUBWF     D,W                ; Subtract one
            GOTO CONT                    ; go to continue

POS     MOVF    D,W                    ;setup for add
            ADDLW    0x01

CONT     MOVWF     D                     ; stores new result back into D for
next loop
                MOVWF     CCPR1L         ; to PWM register channel 1


Thanks in avance
Eric.