How Does Register Addressing Differ From Direct Addressing?

Divergence between Directly and Immediate Addressing Modes

Prerequisite – Addressing Modes

1. Direct Addressing Style:
In straight addressing way, the address field contains the address of the operand.

Constructive Accost (EA) = address field of operand

Example: Add the contents of register 1001 to the accumulator.

Add (1001)

Only a single retention reference is required to access data. So no additional calculations are required to work out effective address.

2. Immediate Addressing Mode:
In immediate addressing way, the operand is a part of the instruction.

Hither the Operand = Accost Field

Example: Add five to the accumulator.

Add together 5

No memory reference is required to fetch data. Then no boosted calculations are required to work out the effective address. It is a fast method. But the downside is that information technology has a limited range.

Now let's compare Direct and Immediate addressing modes.

Directly Addressing Style	Immediate Addressing Mode
Address fields contains the effective accost of operand	There is no address field as the operand is a office of the instruction.
It requires one reference to memory.	It does not crave any reference to retentivity.
Information technology is slower compared to immediate mode.	Information technology is a faster procedure.
It has more range than in immediate mode.	Information technology has a limited range.
Case: Add (1001)	Example: Add 5