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1、Chapter4ProgramDesignofAssembleLanguage主讲教师：黄英Contents：4.1IntroductionofAssembleLanguage24.1.1Features24.1.2Format24.2Basicstructures24.2.1Sequentialprogram24.2.2Branchingprogram34.2.2.1Singlebranchingprogram34.2.2.2.Multi-branchingprogram111．ByusingsomeCJNEinstructions112．Byusing“addresstable”13
2、3．Byusing“jumpinstructiontable”154．Byusingstackoperation184.2.3CircularStructure234.3DelaytimeProgram244.3.1Single-cycledelaytimeprogram244.3.2Longdelaytimeprogram（Multi-cycle）254.3.3Adjustingdelaytimerange254.3.4Getdifferenttimingwithbasicdelayprogram254.4Pseudoinstruction254.5Howtoeditandassemb
3、lethesourceprogram25第7页，共7页4.1IntroductionofAssembleLanguage4.1.1Features1．Producestheoptimizedprogram.2．Programmermustbefamiliarwithhardware.3．Manageandcontrolhardwaredirectly.4．Notuniversal,can’tbetransplanted.4.1.2Format（Detailedinformation:P77）[
4、uctures3types:²SequentialStructure²BranchingStructure²CircularStructure4.2.1SequentialprogramForexample:3-byteunsignedconstantsadditionAssumedthat:50H~52HcellsofinternalRAMhavethreeaugendsrespectively（beginningwithhighbytes）,53H~55HcellsofinternalRAMhavethreeaddendsrespectively（beginningwithhighb
5、ytes）.Requirement:Designaprogramtoputtheadditionresultinto50H~52Hcells（beginningwithhighbytes）,andthecarrybitinto20Hbitofbitaddressablearea.DECR0（50H/51H/52H）=11H/22H/33HDECR1（53H/54H/55H）=77H/88H/99H③MOVA,@R0ADDCA,@R1112233HMOV@R0,A+778899HCLRAADDCA,#00H?④MOVR0,#20H?MOV@R0,A?MOVR0,#52HMOVR1,#55H
6、①MOVA,@R0ADDA,@R1MOV@R0,ADECR0DECR1②MOVA,@R0ADDCA,@R1MOV@R0,A4.2.2Branchingprogram4.2.2.1Singlebranchingprogram·Usingjumpinstructions：P67-68:JZ,JNZ,CJNE,DJNZ（条件转移指令）P73-74:JC,JNC,JB,JNB,JBC（位控制转移指令）第7页，共7页Forexample:ComparethevaluesAssumedthat:Therearethreecontinuouscells（ST1,ST2,ST3）intheexterna
7、lRAMwhereST1andST2have8-bitunsignedbinaryconstantsrespectively.Requirement:Designaprogramtofindthebiggerconstant,andputitintoST3cell.START:CLRC;clearthecarrybitMOVDPTR,#ST1;setthedatapointerMOVXA,@DPTRMOVR2,A;putthe1st
