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PIC Microcontoller Math Method

Small Fast 8 Bit Square Root 

;**********************************************************************
;SMALL 8 BIT SQUARE ROOT
;
;Author: Nikolai Golovchenko <golovchenko at mail.ru>
;Idea: Scott Dattalo <www.dattalo.com>
;"Hint: n^2 = sum of the first n odd integers.(e.g 9 = 3*3 = 1 + 3 + 5)"
;Date: February 16, 2000
;
;Input and output in ACCB0
;ROM - 9
;RAM - 1
;Timing - 12..87 cycles including call and return
;**********************************************************************
Sqrt8s
        movlw -1
Sqrt8s1
        addlw 2
        subwf ACCB0, f
        skpnc
         goto Sqrt8s1
        movwf ACCB0
;       decf ACCB0, f
;Dmitry Kiryashov says: Since W is always holding odd value this decf 
; isn't required I guess. ...  W is always 1,3,5,7,9,.. right?
;and Scott Dattalo aggrees.
        rrf ACCB0, f
        return
;**********************************************************************

file: /Techref/microchip/math/sqrt/sqrt8ngsd.htm, 1KB, , updated: 2000/2/17 10:49, local time: 2024/12/27 10:45,
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