Chapter 5, Problem 21E

Program Plan Intro

Immediate addressing mode:

In immediate addressing mode, the instruction is immediately followed by the data which means that the data that is to be used is already given in the instruction itself.

Example:

ADD R4, #4

This instruction is used to add the data 4 immediately with the contents of register R4.

Direct addressing mode:

The address of the instruction that includes address of an operand is known as direct addressing.

Example:

MOV R3, 46H

This instruction is used to move the data present at the location 46H to register R3.

Indirect addressing mode:

The address of the instruction that includes actual operand is known as indirect addressing.

Example:

MOV R2, 37H

This instruction is used to move the content of address present at 37H to register R2.

Indexed addressing mode:

The address of the operand is acquired by aggregating the contents related to general register to index register that contains constant value.

Example:

MOV R3, R4÷DPTR

This instruction is used to move the content of the register and given constant memory location to register R3.