Q. Salient features of direct addressing mode?
A number of salient points about this technique are:
- This scheme offers a limited address space since if address field has n bits then memory space would comprise 2n memory words or locations. I.e. for illustration machine of Figure above direct addresses memory space will be 210.
• The effective address in this technique is described as address of operand which is,
EA <-- A and (EA in the above illustration will be 500)
D = (EA) (D in the above illustration will be 7)
The second statement implies that the data is stored in memory location specified by effective address.
- In this addressing technique only one memory reference is needed to fetch the operand.