51单片机汇编指令

按功能分为五大类：（1）数据传送类指令（7种助记符）MOV（Move）对内部数据寄存器RAM和特殊功能寄存器SFR的数据进行传送；MOVC（Move Code）读取程序存储器数据表格的数据传送；MOVX (Move External RAM) 对外部RAM的数据传送；XCH (Exchange) 字节交换；XCHD (Exchange low-order Digit) 低半字节交换；PUSH (Push onto Stack) 入栈；POP (Pop from Stack) 出栈；（2）算术运算类指令（8种助记符）ADD(Addition) 加法；ADDC(Add with Carry) 带进位加法；SUBB(Subtract with Borrow) 带借位减法；DA(Decimal Adjust) 十进制调整；INC(Increment) 加1；DEC(Decrement) 减1；MUL(Multiplication、Multiply) 乘法；DIV(Division、Divide) 除法；(3)逻辑运算类指令（10种助记符）ANL(AND Logic) 逻辑与；ORL(OR Logic) 逻辑或；XRL(Exclusive-OR Logic) 逻辑异或；CLR(Clear) 清零；CPL(Complement) 取反；RL(Rotate left) 循环左移；RLC(Rotate Left throught the Carry flag) 带进位循环左移；RR(Rotate Right) 循环右移；RRC (Rotate Right throught the Carry flag) 带进位循环右移；SWAP (Swap) 低4位与高4位交换；(4)控制转移类指令（17种助记符）ACALL（Absolute subroutine Call）子程序绝对调用；LCALL（Long subroutine Call）子程序长调用；RET（Return from subroutine）子程序返回；RETI（Return from Interruption）中断返回；SJMP（Short Jump）短转移；AJMP（Absolute Jump）绝对转移；LJMP（Long Jump）长转移；CJNE (Compare Jump if Not Equal)比较不相等则转移；DJNZ (Decrement Jump if Not Zero)减１后不为０则转移；JZ (Jump if Zero)结果为０则转移；JNZ (Jump if Not Zero) 结果不为０则转移；JC (Jump if the Carry flag is set)有进位则转移；JNC (Jump if Not Carry)无进位则转移；JB (Jump if the Bit is set)位为１则转移；JNB (Jump if the Bit is Not set) 位为０则转移；JBC(Jump if the Bit is set and Clear the bit) 位为１则转移，并清除该位；NOP (No Operation) 空操作；（5）位操作指令（1种助记符）SETB(Set Bit) 位置１。

1.通用数据传送指令.MOV----> moveMOVSX---->extended move with sign dataMOVZX---->extended move with zero dataPUSH---->pushPOP---->popPUSHA---->push allPOPA---->pop allPUSHAD---->push all dataPOPAD---->pop all dataBSWAP---->byte swapXCHG---->exchangeCMPXCHG---->compare and changeXADD---->exchange and addXLAT---->translate2.输入输出端口传送指令.IN---->inputOUT---->output3.目的地址传送指令.LEA---->load effective addressLDS---->load DSLES---->load ESLFS---->load FSLGS---->load GSLSS---->load SS4.标志传送指令.LAHF---->load AH from flagSAHF---->save AH to flagPUSHF---->push flagPOPF---->pop flagPUSHD---->push dflagPOPD---->pop dflag二、算术运算指令ADD---->addADC---->add with carryINC---->increase 1AAA---->ascii add with adjustDAA---->decimal add with adjustSUB---->substractSBB---->substract with borrowDEC---->decrease 1NEC---->negativeCMP---->compareAAS---->ascii adjust on substractDAS---->decimal adjust on substractMUL---->multiplicationIMUL---->integer multiplicationAAM---->ascii adjust on multiplicationDIV---->divideIDIV---->integer divideAAD---->ascii adjust on divideCBW---->change byte to wordCWD---->change word to double wordCWDE---->change word to double word with sign to EAX CDQ---->change double word to quadrate word三、逻辑运算指令AND---->andOR---->orXOR---->xorNOT---->notTEST---->testSHL---->shift leftSAL---->arithmatic shift leftSHR---->shift rightSAR---->arithmatic shift rightROL---->rotate leftROR---->rotate rightRCL---->rotate left with carryRCR---->rotate right with carry四、串指令MOVS---->move stringCMPS---->compare stringSCAS---->scan stringLODS---->load stringSTOS---->store stringREP---->repeatREPE---->repeat when equalREPZ---->repeat when zero flagREPNE---->repeat when not equalREPNZ---->repeat when zero flagREPC---->repeat when carry flagREPNC---->repeat when not carry flag五、程序转移指令1>无条件转移指令(长转移)JMP---->jumpCALL---->callRET---->returnRETF---->return far2>条件转移指令(短转移,-128到+127的距离内) JAE---->jump when above or equalJNB---->jump when not belowJB---->jump when belowJNAE---->jump when not above or equalJBE---->jump when below or equalJNA---->jump when not aboveJG---->jump when greaterJNLE---->jump when not less or equalJGE---->jump when greater or equalJNL---->jump when not lessJL---->jump when lessJNGE---->jump when not greater or equal JLE---->jump when less or equalJNG---->jump when not greaterJE---->jump when equalJZ---->jump when has zero flagJNE---->jump when not equalJNZ---->jump when not has zero flagJC---->jump when has carry flagJNC---->jump when not has carry flagJNO---->jump when not has overflow flag JNP---->jump when not has parity flagJPO---->jump when parity flag is oddJNS---->jump when not has sign flagJO---->jump when has overflow flagJP---->jump when has parity flagJPE---->jump when parity flag is evenJS---->jump when has sign flag3>循环控制指令(短转移)LOOP---->loopLOOPE---->loop equalLOOPZ---->loop zeroLOOPNE---->loop not equal LOOPNZ---->loop not zeroJCXZ---->jump when CX is zero JECXZ---->jump when ECX is zero 4>中断指令INT---->interruptINTO---->overflow interrupt IRET---->interrupt return5>处理器控制指令HLT---->haltWAIT---->waitESC---->escapeLOCK---->lockNOP---->no operationSTC---->set carryCLC---->clear carryCMC---->carry make changeSTD---->set directionCLD---->clear directionSTI---->set interruptCLI---->clear interrupt六、伪指令DW---->definw wordPROC---->procedureENDP---->end of procedure SEGMENT---->segmentASSUME---->assumeENDS---->end segmentEND---->end。