Question:
Which port in 8051 microcontroller requires external pull-up as shown below?
Which port in 8051 microcontroller requires external pull-up as shown below?
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Remember that Port 0 requires external pull-up resistors in 8051 microcontrollers.
Updated On: Feb 27, 2025
- Port 0
- Port 1
- Port 2
- Port 3
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The Correct Option is A
Solution and Explanation
- Port 0 of the 8051 microcontroller requires external pull-up resistors because it is an open-drain port.
- Other ports have built-in pull-up resistors.
Conclusion: The correct answer is option (a).
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