INTRODUCTION TO MICROPEOCESSOR
MICRO PROCESSOR AND MICRO CONTROLLER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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PORT 0
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PORT 1
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PORT 2
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PORT 3
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Explanation:
Detailed explanation-1: -Pins 1 to 8 are the PORT 1 Pins of 8051. PORT 1 Pins consists of 8-bit bidirectional Input / Output Port with internal pull-up resistors.
Detailed explanation-2: -Port 0 (Pin No 32 – Pin No 39) It can be used for input or output. Unlike P1, P2, and P3 ports, we normally connect P0 to 10K-ohm pull-up resistors to use it as an input or output port being an open drain. It is also designated as AD0-AD7, allowing it to be used as both address and data.
Detailed explanation-3: -Port 0 occupies a total of 8 pins (pins 32-39). It can be used for input or output. To use the pins of port 0 as both input and output ports, each pin must be connected externally to a lOK-ohm pull-up resistor.
There is 1 question to complete.