Happy New Year,
   I was just wondering if anyone has an elegant method for determining
whether two numbers are within an absolute difference, in the 12 bit PIC
universe.

  For example...  the two numbers, X & Y, are in registers which must
remain unchanged are to be tested to determine whether they are within
DIFF of each other.

  My first try this year is:

          MOVF       X,W        ;Try it this way
          SUBWF   Y,W

          SKPNC                  ; Positive?
          GOTO      POS      ; Yes

          MOVF       Y,W       ; No, then do it the other way
          SUBWF   X,W

POS  SUBWF  DIFF,W  ; Compare against the limit

          SKPNC                  ; The carry knows...
          GOTO     LESS


Thanks in advance,
   Jen :-)