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ADDRESSING MODES OF ADDRESSING MODES OF 8085 8085 Mr. Gursharan Singh Tatla [email protected] 1 Gursharan Singh Tatla

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  • ADDRESSING MODES OF 8085Mr. Gursharan Singh [email protected]*Gursharan Singh Tatla

    Gursharan Singh Tatla

  • Addressing Modes of 8085To perform any operation, we have to give the corresponding instructions to the microprocessor.In each instruction, programmer has to specify 3 things:Operation to be performed.Address of source of data.Address of destination of result.*Gursharan Singh Tatla

    Gursharan Singh Tatla

  • Addressing Modes of 8085The method by which the address of source of data or the address of destination of result is given in the instruction is called Addressing Modes.The term addressing mode refers to the way in which the operand of the instruction is specified.*Gursharan Singh Tatla

    Gursharan Singh Tatla

  • Types of Addressing ModesIntel 8085 uses the following addressing modes:Direct Addressing ModeRegister Addressing ModeRegister Indirect Addressing ModeImmediate Addressing ModeImplicit Addressing Mode*Gursharan Singh Tatla

    Gursharan Singh Tatla

  • Direct Addressing ModeIn this mode, the address of the operand is given in the instruction itself.

    LDA is the operation.2500 H is the address of source.Accumulator is the destination.

    *Gursharan Singh Tatla

    LDA 2500 HLoad the contents of memory location 2500 H in accumulator.

    Gursharan Singh Tatla

  • Register Addressing ModeIn this mode, the operand is in general purpose register.

    MOV is the operation.B is the source of data.A is the destination.*Gursharan Singh Tatla

    MOV A, BMove the contents of register B to A.

    Gursharan Singh Tatla

  • Register Indirect Addressing ModeIn this mode, the address of operand is specified by a register pair.

    MOV is the operation.M is the memory location specified by H-L register pair.A is the destination.*Gursharan Singh Tatla

    MOV A, MMove data from memory location specified by H-L pair to accumulator.

    Gursharan Singh Tatla

  • Immediate Addressing ModeIn this mode, the operand is specified within the instruction itself.

    MVI is the operation.05 H is the immediate data (source).A is the destination.*Gursharan Singh Tatla

    MVI A, 05 HMove 05 H in accumulator.

    Gursharan Singh Tatla

  • Implicit Addressing ModeIf address of source of data as well as address of destination of result is fixed, then there is no need to give any operand along with the instruction.

    CMA is the operation.A is the source.A is the destination.*Gursharan Singh Tatla

    CMAComplement accumulator.

    Gursharan Singh Tatla

  • *Gursharan Singh Tatla

    Gursharan Singh Tatla


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