51指令

1、MCS51指令集一.數(shù)據(jù)傳送類助記符說明字節(jié)數(shù)周期MOVARn寄存器傳送到累加器112MOVAdirect直接字節(jié)傳送到累加器MOVA@Ri間接RAM傳送到累加器112MOVA#data立即數(shù)傳送到累加器MOVRnA累加器傳送到寄存器112MOVRndirect直接字節(jié)傳送到寄存器MOVRn#data立即數(shù)傳送到寄存器212MOVdirectA累加器傳送到直接字節(jié)MOVdirectRn寄存器傳送到直接字節(jié)224MOVdirectdire

2、ct直接字節(jié)傳送到直接字節(jié)MOVdirect@Ri間接RAM傳送到直接字節(jié)224MOVdirect#data立即數(shù)傳送到直接字節(jié)MOV@RiA累加器傳送到間接RAM112MOV@Ridirect直接字節(jié)傳送到間接RAMMOV@Ri#data立即數(shù)傳送到間接RAM212MOVDPTR#data1616位常數(shù)傳送到數(shù)據(jù)指針MOVCA@ADPTR代碼字節(jié)傳送到累加器124MOVCA@APC代碼字節(jié)傳送到累加器MOVXA@Ri外部RAM(8位地

3、址)傳送到ACC124MOVXA@DPTR外部RAM(16位地址)傳送到ACCMOVX@RiAACC傳送到外部RAM(8位地址)124MOVX@DPTRAACC傳送到外部RAM(16位地址)124PUSHdirect直接字節(jié)壓到堆棧224POPdirect從棧中彈到直接字節(jié)XCHARn寄存器和累加器交換XCHAdirect直接字節(jié)和累加器交換XCHA@Ri間接RAM和累加器交換112XCHDA@Ri間接RAM和累加器交換低4位二.算術(shù)操

4、作類助記符說明字節(jié)數(shù)周期ADDARn寄存器加到累加器112ADDAdirect直接字節(jié)加到累加器ADDA@Ri間接RAM加到累加器112ADDA#data立即數(shù)加到累加器ADDCARn寄存器加到累加器(帶進(jìn)位)112ADDCAdirect直接字節(jié)加到累加器(帶進(jìn)位)ADDCA@Ri間接RAM加到累加器(帶進(jìn)位)112ADDCA#data立即數(shù)加到累加器(帶進(jìn)位)SUBBARnACC減去寄存器(帶進(jìn)位)112SUBBAdirectACC減

5、去直接字節(jié)(帶進(jìn)位)SUBBA@RiACC減去間接RAM(帶進(jìn)位)112SUBBA#dataACC減去立即數(shù)(帶進(jìn)位)INCA累加器加一112INCRn寄存器加一INCdirect直接字節(jié)加一212INC@Ri間接RAM加一DECA累加器減一112DECRn寄存器減一DECdirect直接字節(jié)減一212DEC@Ri間接RAM減一INCDPTR數(shù)據(jù)指針加一124MULABA和B的寄存器相乘DIVABA寄存器除以B寄存器148DAA累加器十

6、進(jìn)制調(diào)整三.邏輯操作類助記符說明字節(jié)數(shù)周期ANLARn寄存器“與“到累加器112ANLAdirect直接字節(jié)“與“到累加器ANLA@Ri間接RAM“與“到累加器112ANLA#data立即數(shù)“與“到累加器ANLdirectA累加器“與“到直接字節(jié)212ANLdirect#data立即數(shù)“與“到直接字節(jié)LARn寄存器“或“到累加器112LAdirect直接字節(jié)“或“到累加器LA@Ri間接RAM“或“到累加器112LA#data立即數(shù)“或“

7、到累加器LdirectA累加器“或“到直接字節(jié)212Ldirect#data立即數(shù)“或“到直接字節(jié)XRLARn寄存器異或到累加器112XRLAdirect直接字節(jié)異或到累加器XRLA@Ri間接RAM異或到累加器112XRLA#data立即字節(jié)異或到累加器XRLdirectA累加器異或到直接字節(jié)212XRLdirect#data立即數(shù)異或到直接字節(jié)六.影響標(biāo)志位的指令指令標(biāo)志指令標(biāo)志COVACCOVACADDXXXCLRC0ADDCXXX