双语教学双语教学2.doc

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1、Ch2   The Exploitation of  Single  Chip MicrocomputerlKeywords:仿真器（emulator）工具软件（facilityandsoftware）键盘（keyboard）电源（powersupply）通信电缆（Communication Cable）仿真插座（Emulatorsocket）在线仿真功能(On-lineemulatorfunction) 在线仿真器（InCircuitEmulator，简称ICE）运行（Execute）、单步运行（Step）、跟踪运行（Trace）

2、、断点运行（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