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Every instruction contains to parts: operation code[opcode],and operand.

The first part of an instruction which specifies the task to be performed by the computer is called opcode.

The second part of the instruction is the data to be operated on.,and it is called operand. The operand[or data]given in the instruction may be in various forms such as 8-bit or 16-bit data, 8-bit or 16-bit address, internal register or a register or memory location.

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