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Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
  • Question

  • The special function registers can be referred to by their hex addresses or by their register names.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • The 8051 Microcontroller problems

    Search Results

    • 1. Which of the following commands will move the number 27H into the accumulator?

    • Options
    • A. MOV A, P27
    • B. MOV A, #27H
    • C. MOV A, 27H
    • D. MOV A, @27
      • Discuss
    • 2. The 8051 has ________ parallel I/O ports.

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 3. To interface external EPROM memory for applications, it is necessary to demultiplex the address/data lines of the 8051.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The I/O ports that are used as address and data for external memory are:

    • Options
    • A. ports 1 and 2
    • B. ports 1 and 3
    • C. ports 0 and 2
    • D. ports 0 and 3
      • Discuss
    • 5. The ADC0804 has ________ resolution.

    • Options
    • A. 4-bit
    • B. 8-bit
    • C. 16-bit
    • D. 32-bit
      • Discuss
    • 6. Bit-addressable memory locations are:

    • Options
    • A. 10H through 1FH
    • B. 20H through 2FH
    • C. 30H through 3FH
    • D. 40H through 4FH
      • Discuss
    • 7. The designs of a centigrade thermometer and a PWM speed-control circuit can be implemented by the 8051.

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

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

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. 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

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