Luis Fernando wrote:
>
> Hi all,
> I'm needing a help.
> I'm looking for a way how get a comparisons with16 bit variables, for
> exemple:
>
> A = B,    A < B   or   A  > B
>
> Somebody could send me any codes?
>
> Best regards
>
> Anbar

Try this. I wrote this a while ago...

Nino.

;*******************************************************************
; A not too optimised 16 bit compare routine for 16 absolute values,
; ie 0 -> 65536.
; Compare WORD to COMP (a word value).
; If WORD = COMP return with 00
; If WORD > COMP return with 01
; If WORD < COMP return with 80
;*******************************************************************

hword   equ     0x10        ; storage for high byte of WORD
lword   equ     hword+1     ; storage for low byte of WORD
hcomp   equ     0x12        ; storage for high byte of COMP
lcomp   equ     hcomp+1     ; storage for low byte of COMP

COMP
    movfw   hcomp           ; get high byte of comp value
    subwf   hword           ; subtract values
    btfsc   status,z        ; first check if result is 0
    goto    COMPL           ; if zero compare low bytes
    btfsc   status,c        ; else test carry bit
    retlw   0x01            ; if WORD > COMP, return with 01h
    retlw   0x80            ; if WORD < COMP, return with 80h

COMPL
    movfw   lcomp           ; get low byte of comp value
    subwf   lbyte           ; subtract values
    btfsc   status,z        ; first check if result is 0
    retlw   0x00            ; if result is 0, return with 00
    btfsc   status,c        ; if c set then WORD > COMP
    retlw   0x01            ; if WORD > COMP, return with 01h
    retlw   0x80            ; if WORD < COMP, return with 80h

end

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