Rodent of Unusual Size wrote:
> One question just leads to another..
> 
> Okey, I've got the idea about not bitwise fiddling the
> outputs directly, but loading them with a bytewise
> MOV from a shadow register.
> 
> What I'm missing is how to handle changing state of
> output bits when the port has mixed functions.  Suppose
> the high four bits/pins are configured as input and
> the low four are outputs.  Will a bytewise write to the
> port have no effect on the inputs?

Correct. It will set something in the output latch
but it will neither be seen in the actual I/O pin, or
when reading from the PORT register.


> Or is that part
> of the RMW aspect I'm not quite getting yet?

Not realy.
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