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The computer instruction and often divided into two parts:
In basic computer, we need 12 bit to specify memory address, the 15th bit of the instruction specifies the addressing mode (0-direct addressing mode, 1 for indirect addressing mode). and the remaining 3 bits for instruction opcode.
The variaous addressing mode are:
a) Direct Addressing Mode:
In this addressing mode, the instruction code contains address of operand.
b) Immediate addressing Mode:
In this addressing mode, the instruction code contains operand.
c) Immediate Addressing Mode:
Instrction code contains address of address of operand.
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