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Home ‣ Digital Electronics ‣ The 8051 Microcontroller Comments
  • Question

  • 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

  • Correct Answer
  • ports 0 and 2 

    • The 8051 Microcontroller problems

    Search Results

    • 1. The ADC0804 has ________ resolution.

    • Options
    • A. 4-bit
    • B. 8-bit
    • C. 16-bit
    • D. 32-bit
      • Discuss
    • 2. 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
    • 3. 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
    • 4. The internal RAM memory of the 8051 is:

    • Options
    • A. 32 bytes
    • B. 64 bytes
    • C. 128 bytes
    • D. 256 bytes
      • Discuss
    • 5. An alternate function of port pin P3.1 in the 8051 is:

    • Options
    • A. serial port input
    • B. serial port output
    • C. memory write strobe
    • D. memory read strobe
      • Discuss
    • 6. 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
    • 7. The 8051 has ________ parallel I/O ports.

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 5
      • Discuss
    • 8. 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
    • 9. The special function registers can be referred to by their hex addresses or by their register names.

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

    • Options
    • A. 10H through 1FH
    • B. 20H through 2FH
    • C. 30H through 3FH
    • D. 40H through 4FH
      • Discuss

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