5 Questions
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.
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.
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 ground (0V).
What happens when a pin of an I/O port is configured as an output and logic 1 is applied?
The pin acts as an 'open drain', allowing external output to float.
What is required to apply logic 1 (5V) on an output pin of an I/O port?
The pin needs to be connected to a pullup resistor.
Test your knowledge on the input/output ports of 8051 microcontrollers. This quiz covers topics such as the number of ports, their configuration, and the total number of pins.
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