When will a program use the direct register addressing mode? What does a program

Question

When will a program use the direct register addressing mode?

What does a program use the immediate value mode for?

cpu memory locations in memory instruction register general-purpose register 1 Immediate value (in the instruction) 2 Direct register reference 3 Direct memory reference 4 Indirect through a register 5 Indirect memory reference Figure 7.6 Illustration of the hardware units accessed when fetching an operand in various addressing modes. Indirect references take longer than direct references.

Explanation / Answer

Addressing modes is the process that is used in programming language to specify how certain values are read within set of instructions. There are various possible modes but the most common mode from all of them is immediate and direct addressing mode.

Direct Addressing mode is meant to be used when the value for particular instruction is poinited to by given value i.e the value is variable and it is stored at given address. For example mobile numbers used inside a country is variable.

Immediate addressing mode is meant to be used when the value for given instruction is specified directly i.e the value is some constant and is being written and treated as immutable in the instruction. For example country code used inside a country is constant.

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