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Replying to @josecastillo

(the obvious thing would’ve been to put TX and RX on adjacent pins; instead, TX is SERCOM5.0 on pin 47 and RX is SERCOM5.3 on pin 30. This lets us use the low power features of pin 47, including outputting a level and generating a slow waveform — 0.5–64 Hz — even in backup mode!)

(original)