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1、Ch4???The?Program?Design?of?Assembly?LanguagelKeywords：機(jī)器語言（MachineLanguage）匯編語言（AssemblyLanguage）高級(jí)語言（High-Level?Language）?簡(jiǎn)單程序（simpleprogram）分支程序（branchprogram）循環(huán)程序（circleorloopprogram）子程序（Subprogram）lIntroduction：The8031supportsMachineLanguage，AssemblyLanguageandHigh-Level?Language
2、programming.Inthe8031assemblyprogramming，theprogramhasoftenthreekindsofforms：Simpleprogram，BranchprogramandCircleprogram.Thenwe’lltellyouhowtodesignaprogram.Togainthefulldepthcontainedineachlinesexplanation,wehighlyrecommendyourefertoeachlineanditsdescription.Line1:stackThisdefinesthe
3、stackentrypoint,allwin32programscontainaSTACK.Line2:dataAlldatadefinitionsaredefinedhereLine3:codeAllProgramcodetobeexecutedgoesbelowthisstatementLine4:START:ThislinetellsthecompilerwheretoexecutetheMAINcode.AllcodewithintheSTARTandENDSTARTlabelsisexecuted.TheprogramwillLOOPthroughthe
4、contentsuntilENDSTARTisfound.Anythingwithaproceeding:isalabel.Line5:movAX,segmsgWecallupontheasm'mov'instructiontomovthecontentsofsegmentofmsgintotheAXRegister.Movisasfollows:movdestination,sourceEg:movAX,10wouldplacethevalue10intotheAXregister.Line6:movds,AXBecausewecannotmoveimmedia
5、tedatadirectlyintotheDSandESregisters,wemustmoveourdataintothegeneralpurposeregisters,andthenfromthere,intotheDataSegmentandExtraSegments.Line7:ENDSTARTWhatIhaveleftoutabovearethelinesthatcontain;'sAlinethatcontainsa;carriesacomment.Anythingafterthe;isconsideredtobeacomment,andisignor
6、edbythecompiler.Acommenthelpsimproveprogramreadability.Hopefullythissmallexampleprogramwillhelpyouonyourwaytolearningthebasicstoassemblerprogramming.Tohelpyouonyourjourney,Iwillnowgiveyousomefuninterruptstoplaywith,thatmayhelpyoudiscovernewandexcitingthings=)InterruptsOneinterruptinwh
7、ichisfoundratherhandyis16H,whichwaitsforasinglekeypressfromthekeyboard,thefollowingcodewillpausetheprogramuntilakeyhasbeenpressed:Nearlyallinterruptswillcallupontheregistersasvariableswhentheyexecutetheirinstructions.Forinterrupt16h,wemustcleartheaxregister.Interrupt16histhestandardke
8、yboar
