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1、CHAPTER2TheMicroprocessoranditsArchitecture(P.48)2-1InternalMicroprocessorArchitecture厂>ssadderAHALBHBLCHCLDHDLSPBFDISIfnstructionpointerSegmentregisterscsDSSSLESIFTemporaryregisteALU&OFDFIFTFSFZFATFFuomrnunicatTonregisterFlagreaister1514:EU；Control•circ
2、uitsBusinterfaceunit(BIU)1―W98Executionunit(EU)123451InstructionstreamqueueCFBuscontrolcircuits:Outer・buses2-1-1TheProgrammingmodel(P.48)0-bitnamesFlGURE2-1TheprogrammingModeloftheIntel8086throughthePentiumIINotes:1.TheshadedareasregistersExistonlyonthe8
3、0386throughThePentiumII.EAXAHTAX
4、ALEBXBHIBXBLECXCHexCLEDXDMDXDLESPSPEBPBPEDIDIESISIEIPIPEFLAGSFLAGS32-bit/16-bitnames(namesAccumulatorBaseindexCountDataStackpointerBasepointerDestinahonindexSourceindexInstructionpointerFlags2.Thearchitectureofthe8086thro
5、ugh80286arefullyupward-Compatibletothe80386throughthePentiumII.MultiourooseReaisters■ThemultipurposeregistersineludeEAX,EBX,ECX,EDX,EBP,EDI5andESI.Theseregistersholdvariousdatasizes(bytes,words,ordoublewords)andareusedforalmostanypurpose,asdictatedbyapro
6、gram.umulator,累加器）■Theaccumulatorisusedforinstructionssuchasmultiplication,division,andsomeoftheadjustmentinstructions.EBX（baseindex,基址寄存器）■TheEBXregistersometimesholdstheoffsetaddressofalocationinthememorysystem.ECX（count,计数寄存器）■ECXholdsthecountforvario
7、usinstructions.EDX（data,数据寄存器）■EDXholdsapartoftheresultfromamultiplicationorpartofthedividendbeforeadivision.EBP（basepointer,基指针寄存器）■EBPpointstoamemorylocationformemorydatatransfers.EDI（destinationindex,目标变址寄存器）■EDIoftenaddressstringdestinationdataforthe
8、stringinstructions.ESI（sourceindex,源变址寄存器）■ESIoftenaddressessourcestringdataforthestringinstructions.Special-purposeRegisters■Thespecial-purposeregistersineludeElP,ESP,EFLAGS,andthesegmentregistersCS,DS,ES,SS,FS,andGS.EIP（instructionpointer,扌旨令］指针寄存器）■El
9、Paddressesthenextinstructioninasectionofmemorydefinedasacodesegment.Theinstructionpointer,whichpointstothenextinstructioninaprogram,isusedbythemicroprocessortofindthenextsequentialinstructioninaprogramlocatedwithinthecodes
