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why in micro controller 8051 pull up resistors are not connected internally at port 0

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uday mehta

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all remaining three ports have pull up resistors internally. then why port 0 has not inter pull up resistors?
 

Port 0 has dynamical push-pull instead. Omitting weak pull-ups apparently seemed appropriate to the original 8051 designers. The detail has been copied with each 8051 compatible IO-port since 30 years. 8051 developers use to know this, or learn it later on.
 
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