PIC16F877 program to find the square root of a given number

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PIC16F877 program to find the square root of a given number

Write an assembly level program for PIC16F877 to find the square root of a given number.

Method: successive subtraction of odd numbers. ROOT increments while NUM ≥ (2·ROOT+1). ROOT holds ⌊√NUM⌋.


; Integer Square Root for 8‑bit NUM on PIC16F877
        LIST P=16F877
        INCLUDE <P16F877.INC>
        __CONFIG _HS_OSC & _WDT_OFF & _PWRTE_ON & _LVP_OFF

        CBLOCK 0x20
NUM     ; input
ROOT    ; result
TEMP
        ENDC

        ORG 0x0000
        GOTO START

START:
        MOVLW .100
        MOVWF NUM
        CLRF ROOT

LOOP_SQRT:
        MOVF ROOT, W      ; W=ROOT
        ADDWF ROOT, W     ; W=2*ROOT
        ADDLW 1           ; W=2*ROOT+1
        MOVWF TEMP

        MOVF NUM, W
        SUBWF TEMP, W     ; if NUM < TEMP -> done
        BTFSS STATUS, C
        GOTO DONE

        MOVF TEMP, W
        SUBWF NUM, F      ; NUM -= TEMP
        INCF ROOT, F
        GOTO LOOP_SQRT

DONE:
        ; ROOT = floor(sqrt(NUM))
        END

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