Anyone have any experiences to share ?

I am writing a system that will use 2 software RS232 connections at 9600.
(I don't use the internal usart because I already had perfectly adjusted
code that could handle both ports in the same routine, so I save space...)

I was using a 4.0000 spec'ed crystal with buildt in capacitors while
developing...
Now, I wish to save a few bucks and drop the oscillator and use the internal
one, but I am concerned about the stability.  It states one place in the
docs that it varies from 3.65 to 4.28 but I don't know if that is a horror
scenario or if it actually could happen.

My initial tests show it works, but that is in a room at 25*C and at 5.1V so
it's very close to test-specs...

    Kyrre

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