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Write short note on relative addressing mode and indirect addressing mode. OR Explain the following addressing modes with the help of an example each :i. Direct ii. Register indirect iii. Implied iv. Immediate v. Indexed

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By Dipali Umre

Addressing modes in computer architecture determine how instructions specify the operands they operate on. Let’s break down each addressing mode with simpler explanations and examples:

  1. Direct Addressing:
    • Explanation: In direct addressing, the operand’s address is directly specified in the instruction.
    • Example: LOAD 500 means load the value from memory address 500 into a register.
  1. Register Indirect Addressing:
    • Explanation: The instruction contains the address of a register whose content is the effective address of the operand.
    • Example: LOAD (R1) means load the value from the memory address stored in register R1 into a register.
  1. Implied Addressing:
    • Explanation: Operand is implied by the instruction itself, often used for operations where operands are known.
    • Example: INCREMENT without specifying any operand directly implies to increment the value in a specific register.
  1. Immediate Addressing:
    • Explanation: The operand’s value is directly specified within the instruction.
    • Example: ADD #10 means add the immediate value 10 to the content of a register.
  1. Indexed Addressing:
    • Explanation: The effective address is generated by adding a constant value to the contents of a register (index).
    • Example: LOAD 600(R2) means load the value from memory address calculated by adding 600 to the content of register R2.
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