双语教学_黄英_《单片机原理及应用》讲义.ppt

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1、Chapter7:SerialCommunicationof80C51MicrocontrollerMicrocontrollerPrincipleandApplication主讲教师：黄英1Chapter7:SerialCommunicationof80C51Microcontroller7.1IntroductionofSerialcommunication7.280C51SerialPortContents:7.3Mode0（8-bitsynchronousshiftregister）7.4Mode17.6ApplicationofserialcommunicationH

2、omeWork7.5Mode2&Mode32Return7.1IntroductionofSerialcommunication1.Featuresofserialdatacommunication2.Typesofserialcommunication3.ConnectionformsofserialcommunicationContents:31.Featuresofserialdatacommunication·Totransferdatabybit·Lowspeed·Fardistance·LowcostReturn4Return2.Typesofserialcommu

3、nicationI.AsynchronousserialtransmissionII.Synchronousserialtransmission5Return·Frameformat:startbit+databit+paritycheckbit+stopbit·TransferdataContinuouslyorspasmodically.I.Asynchronousserialtransmission6Return·Synchronouscharacter+Databit·TransferdataContinuously.·Comparewithasynchronousse

4、rialtransmission,ittransfersdatawithhigherspeed.II.Synchronousserialtransmission73.Connectionformsofserialcommunication·Simplex·Half-duplex·Full-duplexReturn87.280C51SerialPort·SerialPort：Serialinterfacecircuit1.Hardwarestructureof80C51serialportContents:2.ControlRegistersof80C51serialportRe

5、turn91.Hardwarestructureof80C51serialport·UARTUniversalAsynchronousReceiver/Transmitter·USRTUniversalsynchronousReceiver/Transmitter·USARTUniversalSynchronousAsynchronousReceiver/Transmitter10·Transmitregister·Receiveregister·Shiftregister8bitsP3.1P3.0SCONregister:11TwomainfunctionsofSerialp

6、ort:·Paralleldata→Serialdata·Serialdata→ParalleldataP3.1P3.0Return122.Controlregistersof80C51serialport·SerialControlRegister（SCON）P161·InterruptEnableRegister（IE）P101·InterruptPriorityRegister（IP）P102Return137.3Mode080C51serialporthasfourtypesofworkingmodes·mode0,mode1,mode2,mode314Mode0isu

7、sedasa8-bitsynchronousshiftregisterbyadopting“parallelinput/serialoutputchip74165”and“serialinput/paralleloutputchip74164”.（P3.0）（P3.1）·BaudrateofMode0:＝fosc/12Return157.4Mode1·Mode1isa10-bitasynchronousserialcommunicationmodethatintegrates10bitsin