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20066212()JournalofShandongNormalUniversity(NaturalScience)Jun.2006Vol.21No.2(,250014,45,,),.,.;;TN91;TP36,,,n,[1,2].,,[3,4].MCS-51SBUF,SCON2,3.SM2=1,:91,SBUF,RI=1,CPU;90,,.SM2=0,901,RI=1,SBUF.:1)SM2=1,;2),,.,SM2=0,,SM2=1,;3),0.,RXDTXD,TXDRXD,1.121,,,.,,.,,;,.,.,.,,.:TXDRXD,RXDTXD,,,.,,.:TXDTXD,RXD,RXDTXD.2.:1),,,,.;2)TXD,RXD:.,,,.:74HC126.74HC04.P1.0,P1.0=0,TXDRXD,RXDTXD,;P1.0=1,TXDRXD,RXDTXD,.3.:2005-06-09©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.),P1.0=0,SM2=1,(91),(90).2),,SM2=0,P1.0=1,,,8,9.3),,,SM2=0,P,,SM2=1,.4),90,.5),.,SM2=1,.,.6),P1.00,SM21,.2RS485RS485RS232:RS485:1+2+6V,0-2-6V.RS232C.,TTL,TTL.RS48510Mbps.RS485,,.RS4851219.5m(),3000m.RS485128,,RS485.RS485,.:,RTTLPCMOS;RE,.DTTLPCMOS,DE,.AB,RS485.RS485,RS485RS485,;RS485,,,RS485,RS485,4.RS485:,RTTLPCMOS;RE,.DTTLPCMOS,DE,.AB,RS485.RS-485,MAX88.,.5.:,,.:1),,,,;2),;3),,.,.5RS-48543()21©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:8,,...Hamming(7,4).7,4,3.D3D2D1D04,P2P1P03,D3D2D1D0,P2,P1,P03,G2G1G0,G2G1G0=000,.G2G1G07i,,.(7,4),1:D3D2D1P2D0P1P0.7(7,4)D3D2D1P2D0P1P0::G0,:D3D1D0P0,:P0=D3©D1©D0,G0=P0©D3©D1©D0.:G1,:D3D2D0P1,:P1=D3©D2©D0,G1=P1©D3©D2©D0.:G2,:D3D2D1P2,:P2=D3©D2©D1,G2=P2©D3©D2©D1.,,,8,4.44,,.,.G2G1G0,,,.G2G1G02.,,.,.,,.,RS-485.,,..1B7B6B5B4B3B2B1B0D3D2D1P2D0P1P02G2G1G0000001P0-P0010P1-P1011D0-D0100P2-P2101D1-D1110D2-D2111D3-D34[1].[J].,2004,(5):6364[2].PC&DSP[M].:,2003.4[3].RS485[J].,2003,(3):2125[4].[M].:,2202.11IMPROVINGTHENETWORKSTRUCTUREOFMANYSINGLE-CHIPPROCESSORS&ALLOWANCETECHNOLOGYOFDATACOMMUNICATIONChenShouyuan(SchoolofInformationScienceandEngineering,ShandongNormalUniversity,250014,Jinan,China)AbstractThephysicalstructureofdatacommunicationnetworkofsingle-chipprocessorisimprovedtobringaboutdatacommunicationofmanycomputers.Withseriesinputandoutputofsingle-chipprocessors,allowancetechnologyofdatacommunicationofsingle-chipprocessorscanberealized.Kedwordsdatacommunication;single-chipprocessors;networkstructure532:©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.