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1MCS-51指令(1)数据传送类指令(7种助记符)助记符英文注释功能MOVMove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MOVCMoveCode读取程序存储器数据表格的数据传送MOVXMoveExternalRAM对外部RAM的数据传送XCHExchange字节交换XCHDExchangelow-orderDigit低半字节交换PUSHPushontoStack)入栈POPPopfromStack)出栈(2)算术运算类指令(8种助记符)ADDAddition加法ADDCAddwithCarry带进位加法SUBBSubtractwithBorrow带借位减法DADecimalAdjust十进制调整INCIncrement加1DECDecrement减1MULMultiplication、Multiply乘法DIVDivision、Divide除法(3)逻辑运算类指令(10种助记符)ANLAndLogic逻辑与ORLORLogic逻辑或XRLExclusive-ORLogic逻辑异或CLRClear清零CPLComplement取反RLRotateleft循环左移RLCRotateLeftthroughttheCarryflag带进位循环左移RRRotateRight循环右移RRCRotateRightthroughttheCarryflag带进位循环右移SWAPSwap低4位与高4位交换(4)控制转移类指令(17种助记符)ACALLAbsolutesubroutineCall子程序绝对调用LCALLLongsubroutineCall子程序长调用RETReturnfromsubroutine子程序返回RETIReturnfromInterruption中断返回JMPJumpIndirectSJMPShortJump短转移AJMPAbsoluteJump绝对转移LJMPLongJump长转移CJNECompareandJumpifNotEqual比较不相等则转移DJNZDecrementandJumpifNotZero减1后不为0则转移JZJumpifZero结果为0则转移JNZJumpifNotZero结果不为0则转移2JCJumpiftheCarryflagisset有进位则转移JNCJumpifNotCarry无进位则转移JBJumpiftheBitisset)B位为1则转移JNBJumpiftheBitisNotsetB位为0则转移JBCJumpiftheBitissetandClearthebit位为1则转移,并清除该位NOPNoOperation空操作(5)位操作指令(1种助记符)SETBSetBit置位伪指令助记符英文注释功能ORGOriginDBDefineByteDWDefineWordEQUEqualDATADataXDATAExternalDataBITBitENDEnd51外部引脚缩写英文解释中文解释RST(9)Reset复位信号引脚RxD(10--P3.0)ReceiveData串口接收端TxD(11--P3.1)TransmitData串口发送端INT0(————)(12--P3.2)Interrupt0外部中断0信号输入引脚INT1(————)(13--P3.3)Interrupt1外部中断1信号输入引脚T0(14--P3.4)Timer0定时/计数器0输入信号引脚T1(15--P3.5)Timer1定时/计数器1输入信号引脚WR(———)(16--P3.6)write写信号引脚RD(———)(17--P3.7)read读信号引脚PSEN(—————)(29)progammersavingenable外部程序存储器读选通信号ALE(30)AddressLatchEnable地址锁存允许信号EA(———)(31)enable外部ROM选择信号51内部寄存器3SFRspecialfuntionregister特殊功能寄存器ACCaccumulate累加器APSWprogammerstatusword程序状态字CY(PSW.7)carry进位标志位AC(PSW.6)assistantcarry辅助进位标志位OV(PSW.2)overflow溢出标志位PCprogammercounter程序计数器DPTRdatapointregister数据指针寄存器SPstackpoint堆栈指针TCONtimercontrol定时器控制寄存器TF1(TCON.7)Timer1flagT1中断标志位TR1(TCON.6)Timer1RunT1运行控制位TF0(TCON.5)Timer0flagT0中断标志位TR0(TCON.4)Timer0RunT0运行控制位IE1(TCON.3)Interrupt1exterior外部中断1中断标志位IT1(TCON.2)Interrupt1touch外部中断1触发方式选择位IE0(TCON.1)Interrupt0exterior外部中断0中断标志位IT0(TCON.0)Interrupt0touch0-电平触发1-下降沿触发IE(A8H)interruptenable中断允许寄存器EA(IE.7)enableallinterrupt中断总允许位ES(IE.4)enableserial串行口中断允许位ET1(IE.3)enabletimer1T1中断允许位EX1(IE.2)enableexterior1外部中断1中断允许位ET0(IE.1)enabletimer0T0中断允许位EX0(IE.0)enableexterior0外部中断0中断允许位IP(B8H)interruptpriority中断优先级寄存器PS(IP.4)priorityserial串口优先级标志位PT1(IP.3)prioritytimer1定时器1优先级标志位PX1(IP.2)priorityexterior1外部中断1优先级标志位PT0(IP.1)prioritytimer0定时器0优先级标志位PX0(IP.0)priorityexterior0外部中断0优先级标志位PCON(87H)powercontrol电源控制和波特率选择TMOD(89H)timermode定时器方式控制寄存器MSB=mostsignificantbit//最高有效位LSB=lastsignificantbit//最低有效位OE=outputenable//输出使能MCS-51指令(1)数据传送类指令(7种助记符)助记符英文注释功能MOVMove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4MOVCMoveCode读取程序存储器数据表格的数据传送MOVXMoveExternalRAM对外部RAM的数据传送XCHExchange字节交换XCHDExchangelow-orderDigit低半字节交换PUSHPushontoStack)入栈POPPopfromStack)出栈(2)算术运算类指令(8种助记符)ADDAddition加法ADDCAddwithCarry带进位加法SUBBSubtractwithBorrow带借位减法DADecimalAdjust十进制调整INCIncrement加1DECDecrement减1MULMultiplication、Multiply乘法DIVDivision、Divide除法(3)逻辑运算类指令(10种助记符)ANLAndLogic逻辑与ORLORLogic逻辑或XRLExclusive-ORLogic逻辑异或CLRClear清零CPLComplement取反RLRotateleft循环左移RLCRotateLeftthroughttheCarryflag带进位循环左移RRRotateRight循环右移RRCRotateRightthroughttheCarryflag带进位循环右移SWAPSwap低4位与高4位交换(4)控制转移类指令(17种助记符)ACALLAbsolutesubroutineCall子程序绝对调用LCALLLongsubroutineCall子程序长调用RETReturnfromsubroutine子程序返回RETIReturnfromInterruption中断返回JMPJumpIndirectSJMPShortJump短转移AJMPAbsoluteJump绝对转移LJMPLongJump长转移CJNECompareandJumpifNotEqual比较不相等则转移DJNZDecrementandJumpifNotZero减1后不为0则转移JZJumpifZero结果为0则转移JNZJumpifNotZero结果不为0则转移JCJumpiftheCarryflagisset有进位则转移JNCJumpifNotCarry无进位则转移JBJumpiftheBitisset)B位为1则转移JNBJumpiftheBitisNotsetB位为0则转移JBCJumpiftheBitissetandClearthebit位为1则转移,并清除该位5NOPNoOperation空操作(5)位操作指令(1种助记符)SETBSetBit置位伪指令助记符英文注释功能ORGOriginDBDefineByteDWDefineWordEQUEqualDATADataXDATAExternalDataBITBitENDEnd51外部引脚缩写英文解释中文解释RST(9)Reset复位信号引脚RxD(10--P3.0)ReceiveData串口接收端TxD(11--P3.1)TransmitData串口发送端INT0(————)(12--P3.2)Interrupt0外部中断0信号输入引脚INT1(————)(13--P3.3)Interrupt1外部中断1信号输入引脚T0(14--P3.4)Timer0定时/计数器0输入信号引脚T1(15--P3.5)Timer1定时/计数器1输入信号引脚WR(———)(16--P3.6)write写信号引脚RD(———)(17--P3.7)read读信号引脚PSEN(—————)(29)progammersavingenable外部程序存储器读选通信号ALE(30)AddressLatchEnable地址锁存允许信号EA(———)(31)enable外部ROM选择信号51内部寄存器SFRspecialfuntionregister特殊功能寄存器ACCaccumulate累加器APSWprogammerstatusword程序状态字CY(PSW.7)carry进位标志位AC(PSW.6)assistantcarry辅助进位标志位OV(PSW.2)overflow溢出标志位PCprogammercounter程序计数器DPTRdatapointregister数据指针寄存器SPstackpoint堆栈指针TCONtimercontrol定时器控制寄存器TF1(TCON.7)Timer1flagT1中断标志位TR1(TCON.6)Timer1RunT1运行控制位6TF0(TCON.5)Timer0flagT0中断标志位TR0(TCON.4)Timer0RunT0运行控制位IE1(TCON.3)Interrupt1exterior外部中断1中断标志位IT1(TCON.2)Interrupt1touch外部中断1触发方式选择位IE0(TCON.1)Interrupt0exterior外部中断0中断标志位IT0(TCON.0)Interrupt0touch0-电平触发1-下降沿触发IE(A8H)interruptenable中断允许寄存器EA(IE.7)enableallinterrupt中断总允许位ES(IE.4)enableserial串行口中断允许位ET1(IE.3)enabletimer1T1中断允许位EX1(IE.2)enableexterior1外部中断1中断允许位ET0(IE.1)enabletimer0T0中断允许位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