>
>
>Will i inject the wrong values into the uart by writing to the port or
>will the uart ignore my writes to the rx and tx bits (those bits will
>always be zero in the buffer )?
>
Normally, I won't be bothered to find out if it's going to be a problem
or not. If I am going to use two pins as TX/RX for Uart, I would know
that, and then I would protect them from the start. So:
(I don't say it's the best way)
If I have to move a whole buffer onto PortB, and protect two bits, then
I would do it bitwise, ie. read bit in buffer, set/clear bit in PortB
and ignore the bits I want to protect.
Q..

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