Unit 1: 8086 Microprocessor Internal Architecture
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Questions and Answers

Which registers are used to hold the high 16-bit result in a 16 X 16 multiplication?

  • DL and DH (correct)
  • SP and BP
  • SI and DI
  • DX and BX

    • What is the purpose of the Stack Pointer (SP) in the stack segment?

  • Automatically updates due to push instructions
  • Holds the high 16-bit result in multiplication
  • Used as an offset for accessing stack data (correct)
  • Used in indexed addressing

    • When are the Stack Pointer (SP) and Base Pointer (BP) contents automatically updated?

  • During 16 X 16 multiplication
  • During execution of POP or PUSH instructions (correct)
  • During source and destination distinction
  • During indexed addressing

    • What is the role of the Base Pointer (BP) in the current SS?

    <p>Contains an offset address for based addressing mode</p> Signup and view all the answers

    Which pair of registers are used together in indexed addressing for data string processing?

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

    In a 32 ÷ 16 division, which registers hold the high 16-bit dividend (data) before division?

    <p>DL and DH</p> Signup and view all the answers

    What is the main function of the Execution Unit in a microprocessor?

    <p>Executing instructions</p> Signup and view all the answers

    Which register is used by I/O instructions for sending or receiving 16/8 bit data to/from an output/input device in the 8086 microprocessor?

    <p>Accumulator (AX)</p> Signup and view all the answers

    What is the default segment register used with the Base Register (BX) in the 8086 microprocessor?

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

    Which register is used as a counter in instructions like SHIFT, ROTATE, and LOOP in the 8086 microprocessor?

    <p>Counter Register (CX)</p> Signup and view all the answers

    In the 8086 microprocessor, which register consists of two 8-bit registers that can be combined to form a 16-bit register?

    <p>Base Register (BX)</p> Signup and view all the answers

    Apart from general-purpose registers, which type of registers are present in the Execution Unit of the 8086 microprocessor?

    <p>Temporary Registers</p> Signup and view all the answers

    What is the primary purpose of the AX register?

    <p>To store the 16-bit results of arithmetic and logic operations</p> Signup and view all the answers

    Which register is used to hold the base value for accessing data from the stack memory using the SS register?

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

    What is the primary function of the SI and DI registers?

    <p>To hold the index values for source and destination operands in string operations</p> Signup and view all the answers

    Which register is responsible for holding the status of the results after an execution is performed?

    <p>Flag Register</p> Signup and view all the answers

    How many conditional flags are present in the 8086 microprocessor's Flag Register?

    <p>6</p> Signup and view all the answers

    Which register is used to hold data for multiplication and division operations in the 8086 microprocessor?

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

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