Addressing modes of 8085 microprocessor

Addressing modes of 8085 microprocessor –

Addressing modes of 8085 microprocessor –

What is Addressing modes –

“The various technique to specify data for instructions are caused as addressing mode.”

Intel 8085 uses the following addressing Mode –

1. Direct Addressing

2. Register Addressing

3. Register Indirect Addressing

4. Immediate Addressing

5. Implied Addressing

1. Direct Addressing –

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

Example –

(I) STA 2400 H –

Store the content of the accumulator in the memory location 2400 H.

In this instruction 2400 H is the memory address where data is to be stared. It is given in the instruction itself .

(II) IDA C200 –

“Load accumulator directly form memory location.”

in case the content of C200 memory location are transferred to accumulator.

2. Register Addressing –

In this register addressing mode the data to be operated is in the general purpose register.

The registration addressing instruction are generally to 1 byte .

I.e – OPCODE only .

Example –

(I) MOV A , B –

“Move the content of Register B to register A.”

(II) ADD B –

ADD the contents of register B to the content of register A.

3. Register Indirect Addressing –

In this mode of addressing the address of the operand is specified by a register pair .

Example

(I). LXIH 2400H –

load H-L pair with 2400H

(II). mov A , M –

Move the contents of memory “AM”.

4. Immediate Addressing –

In immediate addressing mode the operand is specified within the instruction itself.

Example

(I) MVIA , 05H –

Move 05 in register A.

(II) LZIH , 2400H –

Move 16 bit immediate data 2400 to H-L register pair.

5. Implicit Addressing –

There are certain instructions which operate on the content of the accumulator.

Example –

(I) CMA , RAL , RAR etc.

RAL – “Rotate accumulator last , it operators on the data accumulator only.

What is the Op Amp ?

What is Flip flop ?

IC Operational Amplifier –

Multiplying of two 8 bit number

educationallof
Author: educationallof

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