> Ok, but specifically, why should this RFI only change TRISx and
> not a GPR with even more catastrophic consequences?
> 
> That's why I say that unused pins can be left unconnected and set
> as outputs.. because if TRISx changes, chances are that a lot of
> even more "delicate" GPR's have changed already.

I'm not trying to dodge that issue, but it really depends on the actual
application. Yes, it's quite possible that a GPR affected might be
something like a shadow port register which could have serious
consequences. I agree that some applications should be hardened
against outside interference. For something like a clock it hardly
matters - you just don't put the clock in a particular place or it goes
funny or chews through batteries if an o/p changes to a floating i/p

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