Mark Jurras <JURRAM@TORRINGTON.COM> wrote:
>I am using a pic 16c73 to read a Maxim 12-bit A/D. I am looking for a
>compact routine to determine if the 16-bit word stored, high byte low byte,
>is greater than a stored maximum or less than a stored minimum.

Hi Mark,

   First, a compare macro:



   ;Compare_word compares two words and exits with carry set if
   ;the first is equal to or greater than the second.

compare_word: macro aaa, bbb

   local   exit

   movf    (bbb), w
   subwf   (aaa), w
   btfss   STATUS, Z
   goto    exit
   movf    (bbb + 1), w
   subwf   (aaa + 1), w
exit:
   endm



   Now suppose that you have three register pairs -  max, min, temp
   arranged high byte, low byte.  Then:

   compare max, temp
   bc      temp_gtn_max

   compare temp, min
   bnc     temp_ltn_min


--
Bob Fehrenbach    Wauwatosa, WI     bfehrenb@execpc.com