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1、51单片机英文全称缩写英文解释中义解释RSTRest复位信号引脚RXD(10-P3.0)ReceiveData用口接收端TXD(11-P3.1)TransmitDat串口发送端INT0(12-P3.2)Interrupt。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)Timer。定时/计数器0输入引脚T1(15-P3.5)Timer1定时/计数器1输入引脚WR(16-P3.6)Write写信号引脚RD(17-P3.7)Read读信号引脚PSEN(29)ProgrammerSavingEnable部程序存储器读选通信号ALE(30
2、)AddressLatchEnable地址锁存允许信号EA(31)Enable外部ROM4择信号SFRspecialfunctionregister特殊功能寄存器ACCaccumulate累加器APSWprogrammerstatusword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PCprogrammercounter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)
3、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)interruptexterior外部中断1中断标志位IT1(TCON.2)interrupttouch外部中断1触发方式选择位IE0(TCON.1)interrupt。exterior外部中断0中断标志位IT0(TCON.0)interrupt。touch（0-电平触发1-1降沿触发）IE(A8H)interruptenable中断允许寄存器EA(IE7)enable all
4、 interruptES(IE.4)enable serialET1(IE.3)enable timer1T1EX1(IE.2)enable exterior1ET0(IE.1)enable timer。EX0(IE.0)enable exteriorOIP(B8H)interrupt priorityPS（I国）priority serialPT1(IP3)priority timeriPX1（应）priority exteriorlPT0(IP1)priority timerOPX0(IPO)priority exteriorOPCON(87H)power controlTMOD(89H)timer modeMSBmost significant bitLSBlast significant bitOEoutput enable中断总允许位用口中断允许位中断允许位外部中断1中断允许位T0中断允许位外部中断0中断允许位中断优先级寄存器用口优先级标志位定时器1优先级标志位外部中断1优先级标志位定时器0优先级标志位外部中断0优先级标志位电源控制和波特率选择定时器方式控制寄存器最高有效位最低有效位输出使
