MOV Instruction Quiz and Flashcards: Data Addressing Modes

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Questions and Answers

What is the direction of data flow in the MOV instruction?

Right to Left (correct)
Left to Right
Top to Bottom
Bottom to Top

What is the name of the 8-bit register that is used with register addressing?

BX
CX
AX
AH (correct)

What is the primary function of the opcode in the MOV instruction?

It specifies the data type
It indicates the memory location
It specifies the processor architecture
It tells the microprocessor which operation to perform (correct)

What is the name of the instruction that provides a basis for explanation of data-addressing modes?

MOV (B) Signup and view all the answers

How many bits are in the register names AX, BX, CX, DX, SP, BP, SI, and DI?

16-bit (B) Signup and view all the answers

What type of addressing mode is the most common form of data addressing?

Register Addressing (D) Signup and view all the answers

What is the name of the figure that illustrates the MOV instruction and defines the direction of data flow?

Figure 3-1 (C) Signup and view all the answers

What is the purpose of the opcode MOV in Figure 3-1?

To tell the microprocessor which operation to perform (D) Signup and view all the answers

What is the purpose of the MOV instruction in direct addressing?

To transfer data between a memory location and the AL, AX, or EAX register (A) Signup and view all the answers

What is the length of aMOV instruction that transfers data between a memory location and the AL register?

3-byte (A) Signup and view all the answers

What is the symbolic memory location in the instruction MOV AL,DATA?

DATA (D) Signup and view all the answers

What is the content of the AL register after executing the instruction MOV AL,[1234H]?

The contents of memory location 11234H (C) Signup and view all the answers

What is the value of the DS register in the instruction MOV AL,[1234H]?

1000H (B) Signup and view all the answers

What is the effective memory address used in the instruction MOV AL,[1234H]?

11234H (A) Signup and view all the answers

What is the effective address formed by in a system operating in real mode?

Adding 1234H and 1000H (D) Signup and view all the answers

Which of the following registers are used in Register Indirect Addressing?

BP, BX, DI, SI (C) Signup and view all the answers

What is the purpose of the offset address in Register Indirect Addressing?

To hold the memory location address (A) Signup and view all the answers

What is the result of executing the MOV AX,[BX] instruction when BX = 1000H and DS = 0100H?

AX holds the contents of memory at address 1000H (D) Signup and view all the answers

What is the primary function of the data segment address?

To hold the memory location address (C) Signup and view all the answers

What is the significance of the real mode in a system?

It allows for 16-bit addressing (A) Signup and view all the answers

What is the role of the BX register in the MOV AX,[BX] instruction?

It holds the memory location address (A) Signup and view all the answers

What is the primary function of the offset address in a system?

To hold the memory location address (B) Signup and view all the answers

Study Notes

Data Addressing Modes

The MOV instruction is a common and flexible instruction that provides a basis for explanation of data-addressing modes.
The direction of data flow is from the source (right) to the destination (left) in the MOV instruction.

Register Addressing

Register addressing is the most common form of data addressing.
The microprocessor contains 8-bit register names: AH, AL, BH, BL, CH, CL, DH, and DL.
The microprocessor also contains 16-bit register names: AX, BX, CX, DX, SP, BP, SI, and DI.

Direct Addressing

Direct addressing with a MOV instruction transfers data between a memory location and the AL (8-bit), AX (16-bit), or EAX (32-bit) register.
The instruction is usually 3 bytes long.
The effective address is formed by adding the offset address and the data segment address.

Register Indirect Addressing

Register indirect addressing allows data to be addressed at any memory location through an offset address held in BP, BX, DI, or SI registers.
The instruction transfers data from memory to a register or vice versa.