why we need external pull up for port 0 of micro-controller 8051?

why we need external pull up for port 0 of micro-controller
8051?

Question Posted / pratik limbasiya

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why we need external pull up for port 0 of micro-controller 8051?..

Answer / shantanu

Pull up & pull down resistors must be requird I2C & Micro-
controller/ADC. The output port will be tri stated means 1
or 0, we can't prdict.

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why we need external pull up for port 0 of micro-controller 8051?..

Answer / shaveta

if pull up resistor is not added then the output will not
predict....without this resistance the circuit is called pull
down...

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