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Which out of the four ports of 8051 needs a pull-up resistor for using it is as an input or an output port?

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Which out of the four ports of 8051 needs a pull-up resistor for using it is as an input or an output port?

(a) PORT 0

(b) PORT 1

(c) PORT 2

(d) PORT 3

This question was posed to me by my school teacher while I was bunking the class.

Asked question is from I/O Port Programming and Addressing Modes in section 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Correct option is (a) PORT 0

The explanation is: These pins are the open drain pins of the controller which means it needs a pull-up resistor for using it as an input or an output ports.

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