Datasheet

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M0 and 32u4-based Arduinos do not have a seperate chip, instead the main processor performs this task for you. It

allows for a lower cost, higher power setup...but requires a little more effort since you will need to 'kick' into the

bootloader manually once in a while

I'm trying to upload to my 32u4, getting "avrdude: butterfly_recv(): programmer is not responding"

errors