The UPDI is an adapter to program the new 0/1/2-Series of Microchip ATtiny and ATmega with an FT232 USB/UART bridge and avr-dude. TX line is for transmission from 0/1/2-Series UPDI pin to UART and RX line is for transmission to the 0/1/2-Series UPDI pin. The USB/UART bridge pins have to be checked bevor connection. Otherwise the programming over UPDI does not work.
Used FTDI-Adapter to program the controller
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# !PORT
avrdude.exe -c serialupdi -p t1606 -b 57600 -P COM? -U flash:w:"firmware.hex":a -U eeprom:w:"firmware.eep":a -v
AVR-Dudecan be downloades here
A PCB version can be downloades from Silmors Page
R. GAECHTER