# PICMicrocontollerMathMethod

## 12 Bit Square Root

```;**********************************************************************
;by Nikolai Golovchenko
;12 bit SQARE ROOT
;Input:
;ACCB0 - high byte
;ACCB1 - low byte
;Result:
;ACCB0 - 6bit
;Used:
;TEMPB0 - temporary for result
;TEMPB1 - temporary for input
;LOOPCNT - counter
;Memory used
;32 instructions
;5 RAM bytes
;11+17*5 + 16 + 6 = 118 cycles all cases
;**********************************************************************
Sqrt12	clrf TEMPB0	;clear all used
clrf TEMPB1	;temporary registers
movlw 6		;and setup counter
movwf LOOPCNT	;

swapf ACCB0, f	;Left justify
swapf ACCB1, w	;12bit value
andlw 0x0f	;in two byte
iorwf ACCB0, f	;accumulator
swapf ACCB1, w	;
andlw 0xf0	;
movwf ACCB1	;
Sqrt12a
rlf ACCB1, f	;shift next
rlf ACCB0, f	;two higher bits
rlf TEMPB1, f	;of input
rlf ACCB1, f	;to
rlf ACCB0, f	;TEMPB1
rlf TEMPB1, f	;

movf TEMPB0, w	;take current result (shifted 2 bits left)
addlw 0x01	;and OR with 01 (test bit) - addlw clears C
rlf TEMPB0, f	;and reserve place for the next bit

subwf TEMPB1, w	;test substraction for borrow
btfsc _C
bsf TEMPB0, 2	;set next result bit if no borrow
btfsc _C
movwf TEMPB1	;store substraction result if no borrow

decfsz LOOPCNT	;repeat untill all 6 bits will be found
goto Sqrt12a

bcf _C
rrf TEMPB0, f	;right
rrf TEMPB0, w	;justify the result
movwf ACCB0	;and copy to result register
return
;**********************************************************************
;Last updated 16Nov99

```

 file: /Techref/microchip/math/sqrt/sqrt12.htm, 1KB, , updated: 2001/11/7 06:27, local time: 2022/1/27 03:39, TOP NEW HELP FIND:  23.20.20.52:LOG IN

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