Intel 8085 Addressing Modes

Addressing is the process by which the microprocessor is instructed by the data source and instruction.

The various formats for specifying operands are called Addressing Modes.

There are four types of addressing modes which are:

1.   Register Addressing
2.   Immediate Addressing
3.   Direct Addressing
4.   Indirect Addressing

Register Addressing:   This is a type of addressing mode whereby data is provided through the registers. For Example: MOV B, C


Immediate Addressing:   This is a type of addressing mode whereby the actual data to be operated on is present in the instruction. For Example: MVI A, FE

Direct Addressing:   This is a type of addressing mode whereby data is accepted from an external device or memory location and stored in the accumulator or to send data from the accumulator to external device or memory location.

Indirect Addressing:   This is a type of addressing mode whereby data is accepted from an external device or memory location and stored in any other register but the accumulator or to send data from any other register but the accumulator to external device or memory location.