单片机交通灯中英文资料对照外文翻译文献Word文档格式.docx

单片机交通灯中英文资料对照外文翻译文献Word文档格式.docx

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AboutAT89C51

1.functioncharacteristicsdescription:

AT89C51isalowpowerconsumption,highperformanceCMOS8bitmicro-controller,hasthe8KinsystemprogrammableFlashmemory.Usehigh-densityAtmelcompanythebeltpasswordnonvolatilestoragetechnologyandmanufacturing,andindustrial80S51productinstructionsandpinfullycompatible.ChipFlashallowprogrammemoryinsystemprogrammable,alsosuitableforconventionalprogrammer.Inasinglechip,havedexterous8bitsCPUandinsystemprogrammableFlash,makeAT89C51formanyembeddedcontrolapplicationsystemprovidesthehighflexible,superefficientsolution.AT89C51hasthefollowingstandardfunction:

8kbytesFlash,256bytesRAM,32-bitI/Omouthline,thewatchdogtimer,twodatapointer,three16timer/counter,a6vectorlevel2interruptstructure,full-duplexserialport,pieceinsidecrystalstimelyclockcircuit.Inaddition,AT89C51candropto0Hzstaticlogicoperation,supporttwosoftwarecanchoosepowersavingmode.Idlemode,theCPUtostopworking,allowingtheRAM,timer/counter,serialports,interruptioncontinuetowork.Powerlostprotectionmode,RAMcontentbeingsaved,hasbeenfrozen,microcontrollerallworkstop,untilthenextinterruptionorhardwareresetsofar.Asshowninfigure1fortheAT89C51pinsallotment.

Figure1theAT89C51pinsallotment

2.interruptintroduction

AT89C51hassixinterruptsources:

twoexternalinterruption,（and）,threetimerinterrupt（timer0,1,2）andaserialinterrupts.EachinterruptsourcecanbepassedbuybitsorremoveIEtherelevantspecialregisterinterruptallowcontrolbitrespectivelymakeeffectiveorinvalidinterruptsource.IEalsoincludesaninterruptallowtotalcontrolbitEA,itcanbeabanallinterrupts.IE.Sixisnotavailable.ForAT89C51,IE.5bitsarealsonotbeused.Usersoftwareshouldnotgivethesebitswrite1.TheyAT89seriesfornewproductreserved.Timer2canbeTF2andtheT2CONregistersEXF2orlogicaltriggered.Programintoaninterruptservice,thesignbitcanbeimprovedbyhardwareqing0.Infact,theinterruptserviceroutinemustdeterminewhetherTF2orEXF2activationdisruption,thesignbitmustalsobysoftwareqing0.Timer0and1markatimerTF0andTF1hasbeenpresentedinthecyclecountoverflowS5P2074bits.Theirvalueuntilthenextcyclewascircuitcapturedown.However,thetimer2marksaTF2incountoverflowofthecycleofS2P2074bits,inthesamecyclewascircuitcapturedown

3.externalclockdrivingcharacteristics

symbols

parameters

minimum

Themaximum

unit

1/TCLCL

OscillatorFrequency

24

MHz

TCLCL

ClockPeriod

41.6

ns

TCHCX

HighTime

15

TCLCX

LowTime

TCLCH

RiseTime

20

TCHCL

FallTime

Table1

4.leisureandpowerlostpatternexternalpinsstate

mode

Programmemory

ALE

^psen

Port0

Port1

Port2

Port3

idle

internal

1

data

Data

Idle

External

float

Powerdown

Internal

Table2

About8255chip

1.8255features:

（1）Aparallelinput/outputLSIchips,efficacyofI/Odevices,butasCPUbusandperipheralinterface.

（2）Ithas24programmableSettingsofI/Omouth,eventhreegroupsof8bitsI/Omouthtomouth,PBmouthandPAPCmouth.Theyaredividedintotwogroups12I/Omouth,AgroupincludingportAandCmouth（highfour,PC4~PC7）,includinggroupBandCportBmouth（lowfour,PC0~PC3）.AgroupcanbesettogivebasicI/Omouth,flashcontrol（STROBE）I/Oflashcontrolled,two-wayI/O3modes,GroupBcanonlysettobasicI/OorflashcontrolledtheI/O,andthesetwomodesofoperationmodeentirelybycontrollingregisterscontrolworddecision.

2.8255pinsefficacy:

（1）.RESET:

RESETinputlines,whentheinputoutsideathighlevels,allinternalregisters（includingcontrolregisters）wereremoved,allI/Oportsaredenotinginputmethods.

（2）.CS:

chipchooseastandardlampline1,whentheinputpinsforlowlevels,namely/CS=0,saidchipisselected,allow8255andCPUforcommunications,/CS=1,8255cannotwithCPUdodatatransmission.

（3）.RD:

readastandardlampline1,whentheinputpinsforlowlevels,namely/RD=0and/CS=0,allow8255throughthedatabustotheCPUtosenddataorstateinformation,namelytheCPU8255readfromtheinformationordata.

（4）.TheWR:

writeastandardlights,whentheinputpinsforlowlevels,namely/WR=0and/CS=0,allowstheCPUwilldataorcontrolwordwrite8255.

（5）.D7:

threestatesD0~two-waydatabus,8255andCPUdatatransmissionchannel,whentheCPUexecutioninput/outputinstruction,throughitsrealization8bitsofdataread/writeoperation,controlcharactersandstatusinformationtransmittedthroughthedatabus.

（6）.PA0~PA7:

portAinputandoutputlines,A8bitsofdataoutputlatches/buffers,an8bitsofdatainputlatches.

（7）.PB0~PB7:

portBinputandoutputlines,a8bitsofI/Olatches,an8bitsofinputandoutputbuffer.

（8）.PC0~PC7:

portCinputandoutputlines,a8bitsofdataoutputlatches/buffers,an8bitsofdatainputbuffer.PortCcanthroughthewayofworkingsettingintotwofourports,every4digitportcontainsA4digitlatches,respectivelywiththeportAandportBcooperatetouse,canbeusedascontrolstandardlightsoutputorstatestandardlightsinputports.

（9）.A0,A1:

addressselectionline,usedtoselectthePA8255mouth,PBmouth,PCmouthandcontrollingregisters.

WhenA0=0,A1=0,PAmouthbechosen;

WhenA0=0,A1=1,PBmouthbechosen;

WhenA0=0,A1=1,PCmouthbechosen;

WhenA0=1,A1=1,controlregisterisselected.

ConcerningsevensectionLEDdisplayintroduction

Throughlightemittingdiodechipappropriatelink（includingseriesandparallel）andappropriateopticalstructure.Mayconstitutealuminousdisplaylight-emittingsegmentsorshinepoints.Bytheseluminoussegmentsorshinepointcanbecomposeddigitaltube,symbolstube,mwordpipe,tube,multilevelmatrixdisplaytubeetc.Usuallythedigitaltube,symbolstube,mwordtubewerecalledstrokedisplay,butthestrokedisplaysandmatrixtubecollectivelyreferredtoascharacterdisplays.

1.TheLEDdisplayclassification

（1）bywordhighmarks:

strokemonitorswordhighleast1mm（monolithicintegratedtypemoredigitaltubewordhighincommonly2~3mm）.Othertypesofstrokedisplaytiptop1.27mm（0.5inch）evenuptohundredsofmm.

（2）color-codedscorered,orange,yellow,greenandseveralkinds.

（3）accordingtothestructurepoints,reflectingcovertype,asinglepoint-elasticandmonolithicintegratedtype.

（4）fromtheluminoussectionelectrodeconnectionmodeofpointsofanodeandcathodetwokinds.

2.LEDdisplayparameters

Dueto