Ch3. Addressing Modes

Question 1

Register mode

Answer 1

The operand is stored in one of the registers.

Question 2

Immediate (or literal) mode:

Answer 2

The value of the operand is a part of the instruction

Question 3

Direct (or absolute) mode:

Answer 3

The address of the operand in memory is stored in the instruction

Question 4

Register indirect mode:

Answer 4

The address of the operand in memory is stored in one of the registers (usually an address register).

Question 5

Displacement mode:

Answer 5

The address of the operand is the sum of the contents of a register and a value, called a displacement, specified in the instruction.

Question 6

Indexed mode

Answer 6

Works essentially as the register indirect mode. The register containing the address is called index register

Question 7

PC- relative mode

Answer 7

An offset or displacement is added to the PC.
The PC-relative mode is often used with branches and jumps.Also used in relocatable code where the code and data are both loaded into memory at fixed positions relative to each other.