电气工程及其自动化专业AT89S52单片机应用大学毕业论文英文文献翻译及原文.docx
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电气工程及其自动化专业AT89S52单片机应用大学毕业论文英文文献翻译及原文.docx
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电气工程及其自动化专业AT89S52单片机应用大学毕业论文英文文献翻译及原文
毕业设计(论文)
外文文献翻译
文献、资料中文题目:
AT89S52单片机应用
文献、资料英文题目:
AT89S52MCUApplications
文献、资料来源:
文献、资料发表(出版)日期:
院(部):
专业:
电气工程及其自动化
班级:
姓名:
学号:
指导教师:
翻译日期:
2017.02.14
本科毕业设计(论文)
AT89S52单片机应用中英文翻译
专业名称:
电气工程及其自动化
年级班级:
学生姓名:
指导老师:
AT89S52MCUApplications
FunctionCharacteristicDescription
TheAT89S52isalow-power,high-performanceCMOS8-bitmicrocontrollerwith8Kbytesofin-systemprogrammableFlashmemory.ThedeviceismanufacturedusingAtmel’shigh-densitynonvolatilememorytechnologyandiscompatiblewiththeindus-try-standard80C51instructionsetandpinout.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememorypro-grammer.Bycombiningaversatile8-bitCPUwithin-systemprogrammableFlashonamonolithicchip,theAtmelAT89S52isapowerfulmicrocontrollerwhichprovidesahighly-flexibleandcost-effectivesolutiontomanyembeddedcontrolapplications.TheAT89S52providesthefollowingstandardfeatures:
8KbytesofFlash,256bytesofRAM,32I/Olines,Watchdogtimer,twodatapointers,three16-bittimer/counters,asix-vectortwo-levelinterruptarchitecture,afullduplexserialport,on-chiposcillator,andclockcircuitry.Inaddition,theAT89S52isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialport,andinterruptsystemtocontinuefunctioning.ThePower-downmodesavestheRAMcon-tentsbutfreezestheoscillator,disablingallotherchipfunctionsuntilthenextinterruptorhardwarereset.
PinDescription
VCC:
Supplyvoltage.
GND:
Ground.
Port0:
Port0isan8-bitopendrainbidirectionalI/Oport.Asanoutputport,eachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thepinscanbeusedashigh-impedanceinputs.Port0canalsobeconfiguredtobethemultiplexedlow-orderaddress/databusduringaccessestoexternalprogramanddatamemory.Inthismode,P0hasinternalpull-ups.Port0alsoreceivesthecodebytesduringFlashprogrammingandoutputsthecodebytesdur-ingprogramverification.Externalpull-upsarerequiredduringprogramverification.
Port1:
Port1isan8-bitbidirectionalI/Oportwithinternalpull-ups.ThePort1outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort1pins,theyarepulledhighbytheinter-nalpull-upsandcanbeusedasinputs.Asinputs,Port1pinsthatareexternallybeingpulledlowwillsourcecurrent(IIL)becauseoftheinternalpull-ups.Inaddition,P1.0andP1.1canbeconfiguredtobethetimer/counter2externalcountinput(P1.0/T2)andthetimer/counter2triggerinput(P1.1/T2EX),respectively,asshowninthefollow-ingtable1.Port1alsoreceivesthelow-orderaddressbytesduringFlashprogrammingandverification.
Table1ThesecondfunctionoftheP1port
PortPin
AlternateFunctions
P1.0
T2(externalcountinputtoTimer/Counter2),clock-out
P1.1
T2EX(Timer/Counter2capture/reloadtriggeranddirectioncontrol)
P1.5
MOSI(usedforIn-SystemProgramming)
P1.6
MISO(usedforIn-SystemProgramming)
P1.7
SCK(usedforIn-SystemProgramming)
Port2:
Port2isan8-bitbidirectionalI/Oportwithinternalpull-ups.ThePort2outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort2pins,theyarepulledhighbytheinter-nalpull-upsandcanbeusedasinputs.Asinputs,Port2pinsthatareexternallybeingpulledlowwillsourcecurrent(IIL)becauseoftheinternalpull-ups.Port2emitsthehigh-orderaddressbyteduringfetchesfromexternalprogrammemoryanddur-ingaccessestoexternaldatamemorythatuse16-bitaddresses(MOVX@DPTR).Inthisapplication,Port2usesstronginternalpull-upswhenemitting1s.Duringaccessestoexternaldatamemorythatuse8-bitaddresses(MOVX@RI),Port2emitsthecontentsoftheP2SpecialFunctionRegister.Port2alsoreceivesthehigh-orderaddressbitsandsomecontrolsignalsduringFlashprogram-mingandverification.
Port3:
Port3isan8-bitbidirectionalI/Oportwithinternalpull-ups.ThePort3outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort3pins,theyarepulledhighbytheinter-nalpull-upsandcanbeusedasinputs.Asinputs,Port3pinsthatareexternallybeingpulledlowwillsourcecurrent(IIL)becauseofthepull-ups.Port3receivessomecontrolsignalsforFlashprogrammingandverification.Port3alsoservesthefunctionsofvariousspecialfeaturesoftheAT89S52,asshowninthefol-lowingtable2.
Table2ThesecondfunctionoftheP3port
PortPin
AlternateFunctions
P3.0
RXD(serialinputport)
P3.1
TXD(serialoutputport)
P3.2
(externalinterrupt0)
P3.3
(externalinterrupt1)
P3.4
T0(timer0external
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