单片机查表程序编写 急！

org 0000h

mov 30h, #1

mov 31h, #3

mov 32h, #5

mov 33h, #7

mov 34h, #9

mov 35h, #2

mov 36h, #4

mov 37h, #6

mov 38h, #8

mov 39h, #10

call SQRT

sjmp $

查表法求平方的程序如下。

SQRT:

MOV R0, #30H

MOV R1, #40H

MOV R2, #10

LOOP:

MOV A, @R0

ADD A, #S_TAB - ($ + 4)

MOVC A, @A + PC

MOV @R1, A

INC R0

INC R1

DJNZ R2, LOOP

RET

S_TAB:

DB 1, 4, 9, 16, 25, 36, 49, 64, 81, 100

完

ORG 1000H

MOV DPTR,#2100H

LP0: MOVX A,@DPTR

CJNE A,#41H,LP1

MOV R0,DPL

MOV R1,DPH

MOV DPTR,#21A0H

MOV A,R0

MOVX @DPTR,A

INC DPTR

MOV A,R1

MOVX @DPTR,A

SJMP LP3

LP1: CJNE A,#0FFH,LP2

MOV DPTR,#21A0H

MOV A,#0FFH

MOVX @DPTR,A

INC DPTR

MOVX @DPTR,A

INC DPTR

SJMP LP3

LP2: INC DPTR

SJMP LP0

LP3: SJMP $

END

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