Lesson 25 MCS-51电子技术专业英语教程.ppt

Unit9Microcomputer Lesson25MCS 51 电子技术专业英语教程 冯新宇主编电子工业出版社 2020 1 24 电子技术专业英语教程 2 Lesson25MCS 51 BackgroundsTexttourLanguageinuseVocabularyStructureReading writingtechniques 2020 1 24 电子技术专业英语教程 3 Terminologyassemblylanguage汇编语言 装配语言crystal晶振oscillatoramplifier振荡放大器specialfunctionregister特殊功能寄存器statusregister状态寄存器purposeregister目的寄存器datapointer数据指针movoperationsmov指令操作 Backgrounds 2020 1 24 电子技术专业英语教程 4 Texttour Outline IntroductionBasicPinsPortsDataandProgramMemoryProgramStartAddressDirectMemorySpecialFunctionRegisterGeneralPurposeRegistersAandBRegisters 2020 1 24 电子技术专业英语教程 5 Introduction TheIntel8051microcontrollerisoneofthemostpopulargeneralpurposemicrocontrollersinusetoday ThesuccessoftheIntel8051spawnedanumberofcloneswhicharecollectivelyreferredtoastheMCS 51familyofmicrocontrollers whichincludeschipsfromvendorssuchasAtmel Philips Infineon andTexasInstruments 2020 1 24 电子技术专业英语教程 6 Someofthefeaturesthathavemadethe8051popularare 8 bitdatabus16 bitaddressbus32generalpurposesregistereachof8bits16bittimers usually2 butmayhavemore orless 3internaland2externalinterrupts BitaswellasbyteaddressableRAMareaof16bytes Four8 bitports shortmodelshavetwo8 bitports 16 bitprogramcounteranddatapointer 2020 1 24 电子技术专业英语教程 7 BasicPins PIN9 PIN9istheresetpinwhichisusedresetthemicrocontroller sinternalregistersandportsuponstartingup PINS18and19 The8051hasabuilt inoscillatoramplifierhenceweneedtoonlyconnectacrystalatthesepinstoprovideclockpulsestothecircuit PINS40and20 Pins40and20areVCCandgroundrespectively The8051chipneeds 5V500mAtofunctionproperly althoughtherearelowerpoweredversionsliketheAtmel2051whichisascaleddownversionofthe8051whichrunson 3V 2020 1 24 电子技术专业英语教程 8 PINS29 30and31 Asdescribedinthefeaturesofthe8051 thischipcontainsabuilt inflashmemory Inordertoprogramthisweneedtosupplyavoltageof 12Vatpin31 IfexternalmemoryisconnectedthenPIN31 alsocalledEA VPP shouldbeconnectedtogroundtoindicatethepresenceofexternalmemory PIN30iscalledALE addresslatchenable whichisusedwhenmultiplememorychipsareconnectedtothecontrollerandonlyoneofthemneedstobeselected PIN29iscalledPSEN Thisis programselectenable Inordertousetheexternalmemoryitisrequiredtoprovidethelowvoltage 0 onbothPSENandEApins 2020 1 24 电子技术专业英语教程 9 Ports PORTP1 Pins1to8 TheportP1isageneralpurposeinput outputportwhichcanbeusedforavarietyofinterfacingtasks TheotherportsP0 P2andP3havedualrolesoradditionalfunctionsassociatedwiththembaseduponthecontextoftheirusage PORTP3 Pins10to17 PORTP3actsasanormalIOport butPortP3hasadditionalfunctionssuchas serialtransmitandreceivepins 2externalinterruptpins 2externalcounterinputs readandwritepinsformemoryaccess 2020 1 24 电子技术专业英语教程 10 PORTP2 pins21to28 PORTP2canalsobeusedasageneralpurpose8bitsportwhennoexternalmemoryispresent butifexternalmemoryaccessisrequiredthenPORTP2willactasanaddressbusinconjunctionwithPORTP0toaccessexternalmemory PORTP2actsasA8 A15 ascanbeseenfromFigure25 1 PORTP0 pins32to39 PORTP0canbeusedasageneralpurpose8bitportwhennoexternalmemoryispresent butifexternalmemoryaccessisrequiredthenPORTP0actsasamultiplexedaddressanddatabusthatcanbeusedtoaccessexternalmemoryinconjunctionwithPORTP2 P0actsasAD0 AD7 2020 1 24 电子技术专业英语教程 11 DataandProgramMemory The8051MicroprocessorcanbeprogrammedinPL M 8051Assembly Candanumberofotherhigh levellanguages ManycompilersevenhavesupportforcompilingC foran8051 Programmemoryinthe8051isread only whilethedatamemoryisconsideredtoberead writeaccessible WhenstoredonEEPROMorFlash theprogrammemorycanberewrittenwhenthemicrocontrollerisinthespecialprogrammercircuit 2020 1 24 电子技术专业英语教程 12 ProgramStartAddress The8051startsexecutingprograminstructionsfromaddress0 x00intheprogram 2020 1 24 电子技术专业英语教程 13 DirectMemory The8051has256bytesofinternaladdressableRAM althoughonlythefirst128bytesareavailableforgeneralusebytheprogrammer Thefirst128bytesofRAM from0 x00to0 x7F arecalledtheDirectMemory andcanbeusedtostoredata 2020 1 24 电子技术专业英语教程 14 SpecialFunctionRegister TheSpecialFunctionRegister SFR istheupperareaofaddressablememory fromaddress0 x80to0 xFF Thisareaofmemorycannotbeusedfordataorprogramstorage butisinsteadaseriesofmemory mappedportsandregisters AllportinputandoutputcanthereforebeperformedbymemorymovoperationsonspecifiedaddressesintheSFR Also differentstatusregistersaremappedintotheSFR foruseincheckingthestatusofthe8051 andchangingsomeoperationalparametersofthe8051 2020 1 24 电子技术专业英语教程 15 GeneralPurposeRegisters The8051has4selectablebanksof8addressable8 bitregisters R0toR7 Thismeansthatthereareessentially32availablegeneralpurposeregisters althoughonly8 onebank canbedirectlyaccessedatatime Toaccesstheotherbanks weneedtochangethecurrentbanknumberintheflagstatusregister 2020 1 24 电子技术专业英语教程 16 AandBRegisters TheAregisterislocatedintheSFRatmemorylocation0 xE0 TheAregisterworksinasimilarfashiontotheAXregisterofx86processors TheAregisteriscalledtheaccumulator andbydefaultitreceivestheresultofallarithmeticoperations TheBregisterisusedinasimilarmanner exceptthatitcanreceivetheextendedanswersfromthemultiplyanddivideoperations WhennotbeingusedformultiplicationandDivision theBregisterisavailableasanextrageneral purposeregister 2020 1 24 电子技术专业英语教程 17 VocabularyclonedualmultiplicationconjunctionStructureReading writingtechniques Languageinuse 2020 1 24 电子技术专业英语教程 18 Vocabulary 2020 1 24 电子技术专业英语教程 19 cloneindictionary Cloneafrog cloneaplantvariety 无性生殖的青蛙 无性生殖的植物品种Togrowasaclone 无性繁殖象无性系一样生长oforrelatingtoaclone 属于或关于无性 繁殖 Andyoucan tcloneasoul 而你不能克隆灵魂 formingorderivedfromasingleclone 属于单克隆或由单克隆形成 2020 1 24 电子技术专业英语教程 20 cloneintext ThesuccessoftheIntel8051spawnedanumberofcloneswhicharecollectivelyreferredtoastheMCS 51familyofmicrocontrollers whichincludeschipsfromvendorssuchasAtmel Philips Infineon andTexasInstruments 它的成功又衍生出了许多系列的单片机 本文的单片机是MCS 51系列 这个系列芯片的运营商主要有Atmel Philips Infineon和TI 2020 1 24 电子技术专业英语教程 21 dualindictionary dualbeamspeckleinterferometry双光束散斑干涉法dualmodulationtelemeteringsystems双重调制遥测系统systemofdualleadership双重领导制度dual ratelunarpositioncamera双速月球照相仪Dualcontrolsforpilotandcopilot acarwithdualexhaustpipes 飞行员与副飞行员复式操纵装置 有双排气管的汽车 2020 1 24 电子技术专业英语教程 22 dualintext TheotherportsP0 P2andP3havedualrolesoradditionalfunctionsassociatedwiththembaseduponthecontextoftheirusage 其他端口P0 P2和P3有双重功能 需要根据其使用情况来确定使用它们的哪种功能 2020 1 24 电子技术专业英语教程 23 multiplicationindictionary seedmultiplicationofcrop作物良种繁育Asymbolofmultiplication 乘号avalanchemultiplicationeffectinsemiconductors半导体中的雪崩倍增效应combineorincreasebymultiplication 结合或增加通过增殖 greatlyincreasedasbymultiplication 像做乘法一样极大的增加 2020 1 24 电子技术专业英语教程 24 multiplicationintext WhennotbeingusedformultiplicationandDivision theBregisterisavailableasanextrageneral purposeregister 在不用做乘除法