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Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
  • Question

  • The 8051 has ________ parallel I/O ports.


  • Options
  • A. 2
  • B. 3
  • C. 4
  • D. 5

  • Correct Answer
  • 4 

    • The 8051 Microcontroller problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. The ADC0804 has ________ resolution.

    • Options
    • A. 4-bit
    • B. 8-bit
    • C. 16-bit
    • D. 32-bit
      • Discuss
    • 4. Which of the following instructions will load the value 35H into the high byte of timer 0?

    • Options
    • A. MOV TH0, #35H
    • B. MOV TH0, 35H
    • C. MOV T0, #35H
    • D. MOV T0, 35H
      • Discuss
    • 5. Which of the following commands will copy the contents of RAM whose address is in register 0 to port 1?

    • Options
    • A. MOV @ P1, R0
    • B. MOV @ R0, P1
    • C. MOV P1, @ R0
    • D. MOV P1, R0
      • Discuss
    • 6. 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
    • 7. The special function registers can be referred to by their hex addresses or by their register names.

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

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

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

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

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