从8051到Microchip的汇编转换：快速参考

Whenmigratingassemblylanguageprogramsfrom

onefamilyofmicrocontrollerstoanother,thefirst

questionisalmostalways:“What’stheequivalent

opcode?”Someoperations,likeadditionand

subtraction,areself-evidentandpracticallyuniversal.

Otherinstructionsmayhavesomesubtledifferencesin

syntaxorspellingthatmakedirectconversionsabit

trickier.Occasionally,someinstructionssimplydon’t

haveadirectequivalentinthetargetset,oran

equivalentexistsbutisexplainedindifferentterms.

Anotherquestionthatarisesisthatofaddressing

modes.Typically,DirectandIndirectAddressing

modesarestandardinallarchitectures.However,they

tendtobedifferentinlimitationsandfeatureset.AN880Convertingfrom8051toMicrochipAssembler:AQuickReferenceItisimportanttorememberthatthisreferencelistisAuthor:GaurangKavaiyaMicrochipTechnologyInc.onlyastartingpointforcodeconversion.Thereareseveralconsiderationstokeepinmindwhenmovingcodefrom8-bit8051devicestoPICmicrodevices:1.Thebasicprocessorarchitectureissignificant