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Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
  • Question

  • The number of data registers is:


  • Options
  • A. 8
  • B. 16
  • C. 32
  • D. 64

  • Correct Answer
  • 32 

    • Tags: Bank Exams

    The 8051 Microcontroller problems

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    • 1. Which of the following commands will move the value at port 3 to register 2?

    • Options
    • A. MOV P2, R3
    • B. MOV R3, P2
    • C. MOV 3P, R2
    • D. MOV R2, P3
      • Discuss
    • 2. What is the difference between the 8031 and the 8051?

    • Options
    • A. The 8031 has no interrupts.
    • B. The 8031 is ROM-less.
    • C. The 8051 is ROM-less.
    • D. The 8051 has 64 bytes more memory.
      • Discuss
    • 3. The total external data memory that can be interfaced to the 8051 is:

    • Options
    • A. 32K
    • B. 64K
    • C. 128K
    • D. 256K
      • Discuss
    • 4. The 8051 has ________ 16-bit counter/timers.

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 5. An alternate function of port pin P3.4 in the 8051 is:

    • Options
    • A. Timer 0
    • B. Timer 1
    • C. interrupt 0
    • D. interrupt 1
      • Discuss
    • 6. The following program will receive data from port 1, determine whether bit 2 is high, and then send the number FFH to port 3:
      READ: MOV A,P1
      ANL A,#2H
      CJNE A,#02H,READ
      MOV P3,#FFH

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The contents of the accumulator after this operation
      MOV A,#0BH
      ANL A,#2CH
      will be

    • Options
    • A. 11010111
    • B. 11011010
    • C. 00001000
    • D. 00101000
      • Discuss
    • 8. The last 96 locations in the internal data memory are reserved for general-purpose data storage and stack.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. The contents of the accumulator after this operation
      MOV A,#2BH
      ORL A,00H
      will be:

    • Options
    • A. 1B H
    • B. 2B H
    • C. 3B H
    • D. 4B H
      • Discuss
    • 10. The microcontroller is useful in systems that have nonvariable programs for dedicated applications.

    • Options
    • A. True
    • B. False
      • Discuss

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