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1TheworkprincipleoftheMemory1.ThestructureoftheMemoryTheMemoryisusedtodepositthedata.Itistomakeuseofhighandlowevenelectricitytodepositthedata,andthatistosay,itsdepositingdataisanelectricityevenandhighandlow,notthe1234suchasarithmeticfigure,then,ourriddleundone.Socomputerisnotmysterioustoo.AMemorylookslikesomesmalldrawers,thereareeightsmallblanksinasmalldrawer,everysmallblankisusedtodeposittheelectriccharge,theelectricchargespreadstocomeinorreleasepassingtheelectricwirethatconnectwitheachother,astotheelectricchargehowtoplaceinthesmallblank,weneednotworried.Youcanthinktheelectricwireaswaterpipe.Theelectricchargeintheblankiswater.Thatiseasytocomprehend.Thesmalldrawerinsavingeachoneinthemachineisaplacethatputsthedata,wecallitasaUnit.Wecanstartdepositingthedata.Ifyouwanttoputintoafigure12,thatis00001100,weaslongassaveNo.2andNo.3smallblankinfullelectriccharge,butothersmallelectricchargeintheblanktorelease.Buttheproblemcomesout,Memorycontainalotofunits,thelineistoparallel.Whenyouputtheelectricintoablank,youwillputtheelectricchargeintoallunits,andwhenyoureleasetheelectriccharge,youwillputallelectricchargeineveryunit.SohowmanyunitstheMemoryhave,youcanputthesamepiece,thisofcourseisnotwhatwehope,therefore,weneedmakesomevarietiesontheconstructionslightly.Everyunithasacontrolline,Iwanttoputthedataintowhichunit,thecontrollinethatgiveasignalinthisunit.Thiscontrollineopentheswitch,likethis,electricchargecanthenfluxfree,andtheotherunitcontrollineshavenothesignal,sotheswitchdonotopen,cantsufferfromtheinfluence,likethis,thecontrollinethatonlycontrolthedifferentunit,canwriteintoeachunitthedifferentdata.Thesameas,ifwanttotakethedatainacertainunit,andalsoaslongasopenthehomogeneouscontroltheswitchline.2.TheMemorytranslatesthecodeHowwecometocontroltheeveryunitcontrollinglineAcontrolforreturningremarkably,eachunitdollarlineleadstheoutsideoftheintegratedcircuitnotlineAffaircandontbesosimple,one27512have65536unitsinMemory,haveeachlinethederivationto,thisintegratedcircuitmustmorethan60,000feetNotline,howdo2Wantingtheviewpointreducesthelinearquantity.Wehaveakindofmethodtocallthisastotranslatethecode,thesimpleintroductionisonceCanalinerepresent2kindsofappearances,can2linesrepresent4kindsofappearances,can3linesrepresenthowmanykinds,256kindsofappearancesneedagainhowmanylinesrepresent8kinds8linesSoweneed16linestorepresent65536kindsofappearances.3.TheMemorysenablechipandtheconceptofthebusTothis,translatetheproblemofthecoderesolved,letuscomeagaintopayattentiontoanotherproblem.SendingintoeightlinesofeachunitistousefromwhereofItisfromthecalculationonboardtoconnecttocomeover,generally,theseeightlinesbesidesconnectingtheMemory,stillconnectothermachinepiece,Likethisproblemcomeout,theseeightlinesisnotaMemoryandacomputerappropriatly,ifalwaysacertainunitconnectinghereeightonline,notwell,forexamplethissavingmachinenumberintheunitisfirst0FFH,anothersavingmachineis00H,sothislineafterallistobeplacedinthehighelectricityeven,stilllowelectricityevenWhowillbeharmfulSowewanttoletthemseparate.Thewayiseasycertainly,thelinethatbetheoutsidereceivestheintegratedcircuitleadsthefeetaftercomingin,dontreceivedirectlyeachunitgoto,addingonemoresetofswitchinthecenterline.Usuallywestepasidethepassopens,iffacesreallythisissavingtowriteinthedatainthemachine,orwanttoreadadatafromtheMemory,thenstepasidethepassconnecttheline.ThisswitchfromthreefuseschoiceReadingthecontrolcarry,writesthecontrolcarriestochoosetocarrywiththeslice.Wanttowriteinthedataintoasliceofinside,pickoutfirstthatchip,thensendouttowritealetterthenumber,switchmatchthetop,combiningwillspreadtocomeoverofthedataelectricchargewritesinaninside.Ifread,pickoutfirstthatsliceof,thensendouttoreadtheletterthenumber,theswitchmatchesthetop,datawassentouttogoto.Readdifferentfromwritingaletterthenumbertostillconnecttotheanothertosavethemachineatthesametime,butbecausetheslicechoosesdifferently,althoughreadorwritealetterthenumber,havenothechipenablesignal,soanotherMemorycantmisunderstandopenthedoor,resultintheclash.SowouldthedifferenthourpickouttwochipsAslongasistodesignthesystemcant,donotisourpersontocontrolbutbecontrolledbycomputer,ifreallytheemergenceappearstopickouttwochipscircumstancesatthesametime,thatistherowthatelectriccircuitbreakdown,thisisnot3inourdiscussion.Fromtheintroductionabovewehaveseen,theeightlinesusedtodeliverthedataandarenotspecialused,butalotofcomponentsarepublicused.Sowecallitasthedatatotalline,bynameBUSinEnglishintotalline,totalnamelybusway。Whocanwalk.And16addresseslineistobeconnectedtogether,callitastheaddresstotalline.4.ThesemiconductorMemorysclassificationAccordingtoitsfunction,theMemorycanbedividedintoreadandreadrandomMemorytwomajortype.Socalledacontentsforreading,fromthetypefacecomprehensioniscanonlywithfrominsidereading,cantwritinginto,itsimilarlyinourbook,hairarrivingourreturningafter,ourcanreadinginside,mustnotchangethecontentsonthebookasonespleases.AnEnglishforreadingsavingmachineabbreviationisROMREADONLYMEMORY.Memorysocalledrandomaccess,canrewriteatanytimenamely,thedatathatalsocanreadtheinside,itissimilarinourblackboard,Icanwriteatanytimethethinggoesup,alsocanwipetorewritewiththeblackboard.SavingtheEnglishabbreviationofthemachineaswiththemachineRAMREADRANDOMMEMORYthesetwokindsofsavingmachinesEnglishabbreviationmustkeepinmind.Attentionthesocalledreadtopointwithrandomaccessallthetimeofnormalworkcircumstancedescendingandspeech,andalsoisatusingthethispieceofsavingthemachine,nottimetopointtomakethispieceofchip.Otherwise,readthesavingdatainthemachinetohowcomeofInfact,thistruthisveryeasytocomprehend,thebookgetsholdofourhandistocantchange,canbeitstillwhitepaperinininoriginalmaterialoftime,wasprintedbyprintingpressupcertainly.5.ExplaintheotherafewandfamiliarconceptsbythewayPROM,callitastheprogrammableROM.Thisislikeourexercisebook,buyofthetimeisblank,canwritethethinggoup,canoncewriteup,wipedtodonotdrop,soitcanusetowriteonce,ifwritemistake,submitanexpenseaccount.EPROM,callitasthattheultravioletraywipestheprogrammablethatdividedbyreadsthesavingmachine.Itinsideofaftercontentswritegoup,iffeeldissatisfied,canrewriteafterthrowingawaywithakindofspecialmethod,thisistousestheultravioletrayirradiation,ultravioletrayelephantthewordofworksproperly,canthrowawaytheword,thenrewrite.Certainlythenumberoftimesaremany,andalsoineffectivelight,so4anumberoftimesforcanwipedividedbyisalsoalimitedseveral100times.FLASHROM,callitasthethingthatsavethemachinesoon,itissimilarwiththeEPROM,writingupcanalsowipeofftorewrite,butitwanttheconveniencethesome,donotneedthelightshoneon,aslongasusethescienceofelectricitymethodandthencanwipetodividedby,sotheconvenienceismany,andthelifeistooverylong.Severaltenthousandarriveseveraldonotwait100,000timesEmphasizeagain,thethingsherewriteareallnotatthenormalworkterm.WhetheritisaPROM,EPROMorFLASHROM,theirwritingallhasspeciallimits.Generally,weuseakindofcalledasprogrammablecontrollertodothiswork.Oncepackedtotheworkposition,youwontrewriteliterally.6.Inaddition,todescribetheSinglechipmicrocomputer8051sconfiguration8051filmshaveROMProcedurememory,onlytimeandRamdatamemory,couldwritereadablecategories,whichareseparatememoryaddressspace,andgeneralcomputermemoryallocationmethodisthesame.Usuallyonlyonegeneralcomputeraddressspace,ROMandRamthatcanbearbitrarilyplacedinthecontextofadifferentaddressspace,ROMandRamaddressesinaleaguewithdifferentaddressesinthedistributionspace.CPUvisitstheROM,acorrespondenceaddressonlyMemorymodulecanbeROM,andcanalsobeRam,andasimilarvisitdirective.8051intheMemorystructureisdividedintophysicalprocessesmemoryspaceanddatamemoryspace,atotaloffourstoragespaceinteriorfilms,exteriorfilmsandproceduresproceedROMmemoryspaceanddatamemoryofthefilmsandfilmsoutsidedatamemoryspace,aprocedurememoryanddatamemoryseparatestructure,calledHarvardarchitecture.Fromtheusersperspective,the8051Memoryaddressspaceisdividedintothreecategories1Interiorandforeignfilmsuniformproceduresforsite0000HFFFFHthe64KBROMaddressspace16bitspaceintheaddress.264KBofdatamemoryaddressspacefilm,theaddressfrom0000HFFFFHseriessitewith16addressesforthesite.3256KBdatamemoryaddressspacewitheightaddresslines.Thethreeoverlappingmemoryspaceaddressishowtodistinguishbetweenthreedifferentlogicalspace8051instructionsdifferentdatatransmissionsystemsdesigndirectiveKeyCPUvisitoffilms,foreignfilmsdirectedbyMOVCROM,RAM,visitfilmdirectedbyMOVXvisitfilmsofRamusingMOVinstructions.
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