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Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
  • Question

  • The 8051 can handle ________ interrupt sources.


  • Options
  • A. 3
  • B. 4
  • C. 5
  • D. 6

  • Correct Answer
  • 5 

    Explanation
    There are five interrupt sources for the 8051, which means that they can recognize 5 different events that can interrupt regular program execution. Each interrupt can be enabled or disabled by setting bits of the IE register. Likewise, the whole interrupt system can be disabled by clearing the EA bit of the same register.

    • The 8051 Microcontroller problems

    Search Results

    • 1. This program code will read data from port 0 and write it to port 2, and it will stop looping when bit 3 of port 2 is set:

      STAT: MOV A, PO
        MOV P2,A
        JNB P2.3, STAT

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. This statement will set the address of the bit to 1 (8051 Micro-controller):
      SETB 01H

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Device pins XTAL1 and XTAL2 for the 8051 are used for connections to an external oscillator or crystal.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The designs of a centigrade thermometer and a PWM speed-control circuit can be implemented by the 8051.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Bit-addressable memory locations are:

    • Options
    • A. 10H through 1FH
    • B. 20H through 2FH
    • C. 30H through 3FH
    • D. 40H through 4FH
      • Discuss
    • 6. The 8-bit address bus allows access to an address range of:

    • Options
    • A. 0000 to FFFFH
    • B. 000 to FFFH
    • C. 00 to FFH
    • D. 0 to FH
      • Discuss
    • 7. Which of the following commands will copy the contents of location 4H to the accumulator?

    • Options
    • A. MOV A, 04H
    • B. MOV A, L4
    • C. MOV L4, A
    • D. MOV 04H, A
      • Discuss
    • 8. The following command will rotate the 8 bits of the accumulator one position to the left:
      RL A

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. An alternate function of port pin P3.0 (RXD) in the 8051 is:

    • Options
    • A. serial port input
    • B. serial port output
    • C. memory write strobe
    • D. memory read strobe
      • Discuss
    • 10. The following command will copy the accumulator to the location whose address is 23H:
      MOV 23H,A

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

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