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Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
  • Question

  • 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

  • Correct Answer
  • Timer 0 

    • The 8051 Microcontroller problems

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    • 1. Microcontrollers often have:

    • Options
    • A. CPUs
    • B. RAM
    • C. ROM
    • D. all of the above
      • Discuss
    • 2. Both registers TL0 and TL1 are needed to start Timer 0.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. When the 8051 is reset and the line is HIGH, the program counter points to the first program instruction in the:

    • Options
    • A. internal code memory
    • B. external code memory
    • C. internal data memory
    • D. external data memory
      • Discuss
    • 4. The special function registers are maintained in the next 128 locations after the general-purpose data storage and stack.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The total amount of external code memory that can be interfaced to the 8051 is:

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

    • Options
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      • Discuss
    • 7. The total external data memory that can be interfaced to the 8051 is:

    • Options
    • A. 32K
    • B. 64K
    • C. 128K
    • D. 256K
      • Discuss
    • 8. 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
    • 9. 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
    • 10. The number of data registers is:

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

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