Hello njepsen,
I use Atmega2560. Like i said i have on the RX0 a 1k in serie with a led and it works. If i remove the led or the 1k what is the same the uart0 not receive anymore and the Watchdog that i config with 1024 reset the micro.
Tomorrow i wil make the test that you indicate and will give Feedback
Thank you
Best regards
toto
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