Unit-II Instruction Set and Programs for Intel 8085 • Following major PDF

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memory location specified by the contents of the register pair. Example: STAX B. Page 13. Data Transfer Instructions. Opcode.

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2- Classify the instructions set of 8085 microprocessor. 3- Understand the assembly and machine languages. 4- Explain the operation of data transfer

Unit-II Instruction Set and Programs for Intel 8085 • Following major

Oct 20 2020 Machine and Assembly Languages. • Basic assembly language programs of Intel 8085. Addressing Modes: • Each instruction requires certain data ...

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Unit-II Instruction Set and Programs for Intel 8085 Following major topics have to covered in this unit

Addressing modes of Intel 8085

Classification of Instructions of Intel 8085

Machine and Assembly Languages

Basic assembly language programs of Intel 8085

Addressing Modes:

Each instruction requires certain data on which it has to operate There are various techniques to specify data for instructions

These techniques are called addressing modes

The way of specifying data to be operated by an instruction is known as addressing modes

Intel 8085 uses the following addressing modes:

Direct addressing

Register addressing

Register Indirect addressing

Immediate addressing

Implicit addressing

Direct Addressing:

In this mode of addressing the address of the operand (data) is given in the instruction itself

Example are:

STA 2500H: Store the content of the accumulator in the memory location 2500H

32, 00, 25: The instruction is in coded form

LDA 26FFH: Load the content of the memory location 26FFH to the accumulator

3A, FF, 26: The instruction is in coded form

IN 02: Read data from Port C

DB, 02: The instruction is in coded form

Register Addressing:

In this mode of addressing the operand is in one of the general purpose registers The opcode specifies the address of the register(s) in addition to the operation to be performed

Example are:

MOV A, B: Move the content of register B to register A

78: The instruction is in coded form

ADD B: Add the content ĸ

80: The instruction is in coded form

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[PDF] Unit-II Instruction Set and Programs for Intel 8085 • Following major

Addressing modes of Intel 8085

Classification of Instructions of Intel 8085

Machine and Assembly Languages

Basic assembly language programs of Intel 8085

Addressing Modes:

These techniques are called addressing modes

Intel 8085 uses the following addressing modes:

Direct addressing

Register addressing

Register Indirect addressing

Immediate addressing

Implicit addressing

Direct Addressing:

Example are:

32, 00, 25: The instruction is in coded form

3A, FF, 26: The instruction is in coded form

IN 02: Read data from Port C

DB, 02: The instruction is in coded form

Register Addressing:

Example are:

78: The instruction is in coded form

ADD B: Add the content ĸ

80: The instruction is in coded form

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