Addressing modes in computer architecture In which addressing mode is the memory address of the operand given explicitly within the instruction itself?

Introduction / Context:
Addressing modes define how instructions reference their operands. Recognizing the differences helps with assembly programming, compiler design, and understanding generated machine code.

Given Data / Assumptions:

• We compare absolute (direct) addressing against immediate and indexed addressing.
• “Explicitly given address” means the instruction contains the target memory address as an operand field.
• Terminology: absolute mode is also called direct mode in many texts.

Concept / Approach:

Absolute addressing places the effective memory address directly in the instruction. Immediate mode embeds the data value, not an address. Index mode combines a base (often from a register) with an offset to compute the effective address at run time.

Step-by-Step Solution:

Verification / Alternative check:

Assembly examples often show instructions like “LOAD A, 1000h” using direct addressing where 1000h is the memory address; this is absolute mode.

Why Other Options Are Wrong:

b: Immediate places the operand value in the instruction, not its address. c: Index computes an address from components at run time, not a single explicit address. d: “Modulus mode” is not a standard addressing mode.

Common Pitfalls:

Confusing “immediate value” with “address given immediately”; the former is data, not a pointer.

Final Answer:

Absolute mode