avr 单片机指令详解(英文)

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1、InstructionSetNomenclature:StatusRegister(SREG)SREG:StatusregisterC:CarryflaginstatusregisterZ:ZeroflaginstatusregisterN:NegativeflaginstatusregisterV:Two’scomplementoverflowindicatorS:N⊕V,ForsignedtestsInstructionSetH:HalfCarryflaginthestatusregisterT:TransferbitusedbyBLDandBSTinstructionsI:Globali

2、nterruptenable/disableflagRegistersandOperandsRd:Destination(andsource)registerintheregisterfileRr:SourceregisterintheregisterfileR:ResultafterinstructionisexecutedK:Constantdatak:Constantaddressb:BitintheregisterfileorI/Oregister(3bit)s:Bitinthestatusregister(3bit)X,Y,Z:Indirectaddressregister(X=R2

3、7:R26,Y=R29:R28andZ=R31:R30)A:I/Olocationaddressq:Displacementfordirectaddressing(6bit)Rex.0856B-06/991I/ORegistersRAMPX,RAMPY,RAMPZRegistersconcatenatedwiththeX,YandZregistersenablingindirectaddressingofthewholedataspaceonMCUswithmorethan64Kbytesdataspace,andconstantdatafetchonMCUswithmorethan64Kby

4、tesprogramspace.RAMPDRegisterconcatenatedwiththeZregisterenablingdirectaddressingofthewholedataspaceonMCUswithmorethan64Kbytesdataspace.EINDRegisterconcatenatedwiththeinstructionwordenablingindirectjumpandcalltothewholeprogramspaceonMCUswithmorethan64Kbytesprogramspace.StackSTACK:Stackforreturnaddre

5、ssandpushedregistersSP:StackPointertoSTACKFlags⇔:Flagaffectedbyinstruction0:Flagclearedbyinstruction1:Flagsetbyinstruction-:Flagnotaffectedbyinstruction2InstructionSetInstructionSetConditionalBranchSummaryTestBooleanMnemonicComplementaryBooleanMnemonicCommentRd>RrZ•(N⊕V)=0BRLT(1)Rd≤RrZ+(N⊕V)=1BRGE*S

6、ignedRd≥Rr(N⊕V)=0BRGERdRrZ•(N⊕V)=0BRLT*SignedRdRrC+Z=0BRLO(1)Rd≤RrC+Z=1BRSH*UnsignedRd≥RrC=0BRSH/BRCCRdRrC+Z=0BR

7、LO*UnsignedRd