MOV Instruction and 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?

    <p>MOV</p> Signup and view all the answers

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

    <p>16-bit</p> Signup and view all the answers

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

    <p>Register Addressing</p> 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?

    <p>Figure 3-1</p> Signup and view all the answers

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

    <p>To tell the microprocessor which operation to perform</p> Signup and view all the answers

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

    <p>To transfer data between a memory location and the AL, AX, or EAX register</p> Signup and view all the answers

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

    <p>3-byte</p> Signup and view all the answers

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

    <p>DATA</p> Signup and view all the answers

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

    <p>The contents of memory location 11234H</p> Signup and view all the answers

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

    <p>1000H</p> Signup and view all the answers

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

    <p>11234H</p> Signup and view all the answers

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

    <p>Adding 1234H and 1000H</p> Signup and view all the answers

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

    <p>BP, BX, DI, SI</p> Signup and view all the answers

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

    <p>To hold the memory location address</p> Signup and view all the answers

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

    <p>AX holds the contents of memory at address 1000H</p> Signup and view all the answers

    What is the primary function of the data segment address?

    <p>To hold the memory location address</p> Signup and view all the answers

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

    <p>It allows for 16-bit addressing</p> Signup and view all the answers

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

    <p>It holds the memory location address</p> Signup and view all the answers

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

    <p>To hold the memory location address</p> 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.

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    Description

    Learn about the MOV instruction and its role in explaining data-addressing modes, including the direction of data flow and opcode operations.

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