> 3) They only want pullups on certain pins.

One thing to note: even if port B pullups are enabled, they are
automatically disabled on pins that are set as outputs. This can be
important for reducing power consumption. To see why, assume that they were
not disabled on outputs. Now any pin that is outputting a zero is doing so
by pulling against the weak pullup and current will flow.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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