Why different addressing modes

Get more notes and other study material of Computer Organization and Architecture. Computer Organization and Architecture. Addressing Modes- The different ways of specifying the location of an operand in an instruction are called as addressing modes. Types of Addressing Modes- In computer architecture, there are following types of addressing modes-.

Addressing Modes Types of Addressing Modes. The operand is an immediate value is stored explicitly in the instruction:. Example : textbook uses instructions type like, opcode source, dest. The address of the operand is obtained by adding to the contents of the general register called index register a constant value.

The number of the index register and the constant value are included in the instruction code. Index Mode is used to access an array whose elements are in successive memory locations. The content of the instruction code, represents the starting address of the array and the value of the index register, and the index value of the current element. By incrementing or decrementing index register different element of the array can be accessed. Related Articles. Instruction pipelining.

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