8051 Microcontroller Ports Quiz
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Questions and Answers

Which of the following statements accurately describes the I/O ports of 8051 microcontrollers?

  • There are 4 I/O ports, each with 8 pins, which can be configured as input or output. (correct)
  • There are 8 I/O ports, each with 4 pins, which can be configured as input or output.
  • There are 4 I/O ports, each with 8 pins, which can only be configured as output.
  • There are 4 I/O ports, each with 8 pins, which can only be configured as input.

    • What happens when a pin of an I/O port is configured as an input?

  • The pin acts as if it 'floats', with unlimited input resistance and indeterminate potential. (correct)
  • The pin acts as an 'open drain', allowing external output to float.
  • The pin is connected to a pullup resistor.
  • The pin is connected to ground (0V).

    • What happens when a pin of an I/O port is configured as an output and logic 0 is applied?

  • The pin is connected to a pullup resistor.
  • The pin acts as an 'open drain', allowing external output to float.
  • The pin acts as if it 'floats', with unlimited input resistance and indeterminate potential.
  • The pin is connected to ground (0V). (correct)

    • What happens when a pin of an I/O port is configured as an output and logic 1 is applied?

    <p>The pin acts as an 'open drain', allowing external output to float. (C)</p> Signup and view all the answers

    What is required to apply logic 1 (5V) on an output pin of an I/O port?

    <p>The pin needs to be connected to a pullup resistor. (D)</p> Signup and view all the answers

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