
Concept explainers
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.

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Chapter 5 Solutions
Essentials of Computer Organization and Architecture
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