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1、Ch2???The?Exploitation?of??Single??Chip?MicrocomputerlKeywords:仿真器（emulator）工具軟件（facilityandsoftware）鍵盤（keyboard）電源（powersupply）通信電纜（Communication?Cable）仿真插座（Emulatorsocket）在線仿真功能(On-lineemulatorfunction)?在線仿真器（InCircuitEmulator，簡稱ICE）運行（Execute）、單步運行（Step）、跟蹤運行（Trace）
2、、斷點運行（Breakpoint）lIntroduction:?????Anassemblerisaprogramthattranslatessymboliccode(assemblylanguage)intoexecutableobjectcode.Thisobjectcodecanbeexecutedwitha80C51-compatiblemicrocontroller.Ifyouhaveeverwrittenacomputerprogramdirectlyinmachine-recognizableform,suchasbi
3、naryorhexadecimalcode,youwillappreciatetheadvantagesofprogramminginsymbolicassemblylanguage.?????Assemblylanguageoperationcodes(mnemonics)areeasilyremembered(MOVformoveinstructions,ADDforaddition,andsoon).Youcanalsosymbolicallyexpressaddressesandvaluesreferencedintheop
4、erandfieldofinstructions.Becauseyouassignthesenames,youcanmakethemasmeaningfulasthemnemonicsfortheinstructions.Forexample,ifyourprogrammustmanipulateadateasdata,youcanassignitthesymbolicnameDATE.Ifyourprogramcontainsasetofinstructionsusedasatimingloop(executedrepeatedl
5、yuntilaspecificamountoftimehaspassed),youcannametheinstructiongroupTIMER_LOOP.?????Anassemblyprogramhasthreeparts:1.Machineinstructions-Codethemachinecanexecute.Detaileddiscussionofthemachineinstructionsisinthehardwaremanualsofthe80C51microcontroller.2.Assemblerdirecti
6、ves-Definetheprogramstructureandsymbols,andgeneratenonexecutablecode(data,messages,andsoon.).3.Assemblercontrols-Setassemblymodesanddirectassemblyflow.programhasAnassemblyprogramiswrittenusingasimpletexteditor.Eachassemblerhasspecificsyntaxrulesregardingthestructureoft
7、hesourcefileandthenamesthatareusedtorepresentassemblerdirectives,opcodes,andoperands.Therearealsosyntaxrulesregardingcommentsinthefile？Assemblerdirectivesareusedbytheassemblertocontrolassembleroperation.Forexample,theassemblercanbedirectedtooutputprogramcodeataspecific
8、address(usingtheORGor.orgdirective).Assemblyprocess:1.Createsourcefileusingatexteditorandsaveit(.ASM)2.Executecommand
