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ADDRESSING MODES OF 8085

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ADDRESSING MODES OF 8085. Ad d ressing Modes of 8085. T o p e rform a n y op e rat i o n , we h a ve to g i ve t h e corres p o n d i ng i n structi o ns to the micro p rocesso r . In e a ch instr u ctio n , pr o gr a m m er h a s t o speci f y 3 t h i n gs: Ope r at i on to be p erfo rm ed.

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ad d ressing modes of 8085
AddressingModesof8085
  • Toperformany operation,wehave to givethecorrespondinginstructionsto themicroprocessor.
  • Ineachinstruction,programmerhas to
  • specify3things:
    • Operationtobeperformed.
    • Addressofsourceofdata.
    • Addressofdestinationofresult.
ad d ressing modes of 80851
AddressingModesof8085
  • Themethod by whichtheaddressof sourceof dataortheaddressof destinationofresultis givenin the instructioniscalledAddressing Modes.
  • Thetermaddressingmoderefersto thewayinwhichtheoperandofthe instructionisspecified.
t ypes of ad d ressing modes
TypesofAddressingModes
  • Intel8085usesthefollowing
  • addressingmodes:
    • DirectAddressingMode
    • RegisterAddressingMode
    • RegisterIndirectAddressingMode
    • ImmediateAddressingMode
    • ImplicitAddressingMode
direct ad d ressing mode
DirectAddressingMode
  • Inthis mode,theaddressofthe operandis givenintheinstruction itself.

LDA2500H

Loadthecontents of memory

location2500H inaccumulator.

  • LDAis theoperation.
  • 2500His theaddressofsource.
  • Accumulatoris thedestination.
register addressing mode
RegisterAddressingMode
  • Inthis mode,theoperandisin general
  • purposeregister.

Movethecontents ofregisterB to A.

MOVA,B

  • MOVis theoperation.
  • Bis thesourceofdata.
  • Ais thedestination.
slide7

Register IndirectAddressing

Mode

  • Inthis mode,theaddressofoperand
  • isspecifiedbyaregisterpair.

MOVA,M

Movedatafrommemorylocation specifiedbyH-Lpair to accumulator.

  • MOVis theoperation.
  • Misthememory locationspecifiedby
  • H-Lregisterpair.
  • Ais thedestination.
immediate ad d ressing m o de
ImmediateAddressingMode
  • Inthis mode,theoperandisspecified
  • withintheinstructionitself.

MVI A, 05 H

Move05 H inaccumulator.

  • MVIis theoperation.
  • 05His theimmediatedata(source).
  • Ais thedestination.
imp l ic i t addressing mode
ImplicitAddressingMode
  • Ifaddress of sourceof dataas wellas addressof destinationofresultis fixed, thenthere is noneedto giveany operandalongwiththe instruction.
  • CMA Complement accumulator.
  • CMAis the operation.
  • Aisthesource.
  • Ais the destination.
ad