黄英_《单片机原理及应用》讲义课件.ppt

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1、Chapter3:InstructionsystemMicrocontrollerPrincipleandApplication主讲教师：黄英1Contents:3.1InstructionformatandAddressingModes3.2InstructionIntroductionChapter3Instructionsystem2•AssembleLanguage:symboliclanguage•Assembler:Acomputerprogramusedtoassemble•SourceProgramAssemblerObjectprogram（Sourcec

2、odes）（Machinecodes）•InstructionSet:cannottransplantdirectlyChapter3Instructionsystem3.1InstructionformatandAddressingModes33.1InstructionformatandAddressingModes3.1.1Instructionformat•Instruction=opcodeoperand=opcodedestinationoperand,sourceoperand•Instructiontypes:1-byteInstruction:includes

3、opcodeandoperand2-byteInstruction:1thbyteisopcode2thbyteisoperand3-byteInstruction:1thbyteisopcode2th,3thbyteareoperands43.1InstructionformatandAddressingModes•Addressing:howtogetthelocationof(source)operand.•AddressingModes:7types1.RegisterAddressing2.DirectAddressing3.RegisterIndirectAddre

4、ssing4.ImmediateConstantsAddressing5.IndexedAddressing6.BooleanAddressing3.1.2AddressingModes7.RelativeAddressing（getthejumpingdestinationaddressofPC）53.1.2AddressingModes1.RegisterAddressing•Operand:denotedbyregister.Forexample:MOVA,R0•AddressingRange:①Generalregister:4banks×8（R0～R7）＝32regi

5、sters②SomeSFRs:A,AB,DPTR,etc.63.1.2AddressingModes•Operand:denoteddirectlyby8-bitaddress.Forexample:MOVA,3AH•AddressingRange:①Lower128bytesofinternalRAM②SFRs2.DirectAddressing73.1.2AddressingModes•Operand:specifiesaregistertocontainoperandaddresswiththeprefix“@”.•AddressingRange:①Lower128byt

6、esofinternalRAM（8-bitaddress）②64KBofexternalRAM（16-bitaddress）3.RegisterIndirectAddressing•addressregisterof8-bitaddress:Ri（i=0,1）SP（PUSH,POP）addressregisterof16-bitaddress:DPTRForexample:MOVA,@R0MOVXA,@DPTR83.1.2AddressingModes•Operand:specifiesthevalueofa8-bitor16-bitconstantwiththeprefix“

7、#”.Forexample:MOVA,#3AHMOVDPTR,#0200H4.ImmediateConstantsAddressing93.1.2AddressingModes•Onlythreeinstruction:MOVCA,@A+DPTRMOVCA,@A+PCJMP@A+DPTR•AddressingRange:ProgramMemory（ROM）5.IndexedAddressing•ProgramMemorycanonlybeaccessedviathismode.•Design