Addressing Modes in Microprocessors

Which of the following is an example of Immediate addressing mode?

• MOV A, B

• MOV A, 50H

• MOV M, A

• MOV B, C

The instruction LXI H, 2000H is an example of which addressing mode?

• Register

• Indirect

• Immediate

• Direct

In Direct addressing mode, the operand is:

• A constant value

• A memory address given in the instruction

• Stored in a register

• Loaded from an external source

Which instruction is an example of Direct addressing mode?

• MOV A, M

• LDA 2500H

• MOV B, A

• XCHG

What is a major drawback of Direct addressing mode?

• Requires large memory

• Execution speed is slow

• Operand must be stored in a register

• Cannot access external memory

Register addressing mode is used when:

• Operands are stored in memory

• Operands are stored in registers

• Operands are constants

• None of the above

Which instruction is an example of Register addressing mode?

• MOV A, B

• MOV A, M

• LDA 5000H

• STA 2500H

What is the advantage of Register addressing mode?

• Uses less memory

• Reduces instruction size

• Faster execution

• All of the above

Which of the following is an example of Indirect addressing mode?

• MOV A, 32H

• MOV A, M

• MOV A, B

• MOV H, 4000H

Indirect addressing mode is useful when:

• Working with registers

• Accessing stack memory

• Accessing data stored in memory

• None of the above