[SOLVED] Why in port 0 each pin must be connected to 10k ohm pull-up resistors in 8051?

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ajit1992

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All i know is that Port 0 has open drain output drivers so the pull-ups must be provided externally.
Ports 1, 2, and 3 have built in internal pull-ups.
But my question is why only 10k ohm resistors are to be used why not some other value?
 

But my question is why only 10k ohm resistors are to be used why not some other value?
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10k is a good standard, but not the only possible value. According to DC specifications of CMOS 8051, a range of 1.5 - 100 k would be feasible. The decision depends on the connected periperals and e.g. intended operation speed.
 
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