Stirrings from long ago.
Idea starters. Or not.

Writing to a control register may affect pin level differently depending on
what is in the pin's data register.
Without looking at your PIC I don't know if there is any way that this may
be applied but it may be adding or removing a pullup, converting from input
to output etc.

Also, in the definitely naughty department::
- Behaviour of a pin that varies depending on external load level.
- RMW attributes in conjunction with any above.


  R
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