Use INCFSZ with the twos-complement of the desired loop count:

Let NumLoops=<whatever>

      movlw high(-NumLoops)
      movwf LoopCounterHi
      movlw low(-NumLoops)
      movwf LoopCounterLo
Loop
      [something useful]
      incfsz LoopCounterLo,f
      goto   Loop            ; keep looping til we hit 0
      incfsz LoopCounterHi,f
      goto   Loop            ; keep looping til we hit 0
      return                 ; exit

Bob  Ammerman
RAm Systems

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