Depending on what you want to do with the result, I would probably go
with a redundant version... Something like:

movf VALUE,w
addlw 1
movwf VALUE
btfss STATUS,DC
return
andlw 0xf0
addlw 16+6
movwf VALUE
btfss STATUS,C
return
andlw 0x0f
addlw 6*16
movwf VALUE
incf VALUE+1,f
return

Which would still count to 16, but reset things on an overflow. You
would need a correction routine if you want to actually use the
result, but it allows for slightly faster increases and decreases, I
think.

Note that the above routine was written in the Email, and not tested in any way.

Greetings,
Maarten Hofman.

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