Well, one more quick question:  what does the z bit in the status register
indicate?  I assume it must be cleared in software...

btw thanx for all the great responses...

        Jeff

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jason Muhammad
Sent: December 4, 1999 12:49 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: PIC Table Read and Compare Questions


Can also be done with XOR, four instructions; you can also express the
BEQ DESTINATION as one of the Macro Arguments.

BEQ MACRO FILE1, FILE2, DESTINATION
        MOVF    FILE1, W
        XORWF   FILE2,W         ;If FILE=W, W is b'00000000', and
        BTFSC   STATUS, Z       ;the Z bit is SET.
        GOTO    DESTINATION
        ENDM
; --Not equal-- code here

--
Jason
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> Michael Rigby-Jones wrote:
>
>      2.   What is the best way to determine if a variable is equal to
>      a certain
>      value?  It's easy if you're testing one bit, but more than one
>      leaves me
>      confused.  Or rather, what is comparable to the hll instruction:
>
>      if var = 3 then
>      ....
>      end if
>
>      I assume that you would use bit logic (and, or) to do this, but
>      what is the
>      easiest way?
>
> The easiest way is to do a subtract and test for zero.
>
> movlw   3
> subwf   var,w
> btfsc   status,z
> goto    equal
> goto    not_equal
>
> Mike Rigby-Jones