Direct Address and Indirect Address In some cases, it is convenient to use the address bits of an instruction code not as an address, but as the actual operand. If the second part of an instruction code specifies an operand, then it is said that the instruction has an immediate operand.
If the second part specifies the address of an operand, then it is said that the instruction has a direct address.There is also a third possibility called indirect address, where the bits in the second part of the instruction specify an address of a memory word in which the address of the operand is obtained. In the instruction code, one bit is used to distinguish between a direct and an indirect address.
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