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8位單片機(jī)乘法函數(shù)

作者：時(shí)間：2016-11-24 來(lái)源：網(wǎng)絡(luò)

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;--------------------------------------------

;NAME:F_Mul
;INPUT:R_opA,R_opB
;OUTPUT:R_opRes,R_opMod
;FUN:R_opMod積高位(當(dāng)積大于255)，R_opRes積低位
;--------------------------------------------
.IFJ_MulOpera
F_Mul:
LDAR_opB
PHA

本文引用地址：http://www.ex-cimer.com/article/201611/320820.htm

LDA#00H
STAR_opMod
STAR_opRes

LDAR_opA
ORAR_opB
BEQEND_MUL

MUL_LOOP:
%ClearWDT

LDAR_opB
BEQEND_MUL

CLC
LDAR_opRes
ADCR_opA
STAR_opRes

LDA#00H
ADCR_opMod
STAR_opMod

DECR_opB
JMPMUL_LOOP

END_MUL:
PLA
STAR_opB
LDAR_opRes
RTS
.ENDIF

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8位單片機(jī)乘法函數(shù)

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