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I have a Teensy 2.0 with a ATmega32u4 and I can use both, with the USB as Serial.* and the hardware UART as Serial1.*
For the Arduino Pro Micro it is the same. See Arduino Pro Micro, get data out of Tx pin?
For Teensy, see https://www.pjrc.com/teensy/td_uart.html
Dave X
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