![]() ![]() In rare cases where you may need to update the firmware on that processor, you can use the secondary ICSP headers to do so. The board has a secondary ICSP headers that are connected to the ATmega16U2 processor on board. ![]() This allows your program on the board to communicate with the computer via serial interface and abstract away the USB protocol completely.Īrduino Uno Rev3 ATmega16U2 as USB to Serial Converter Arduino Uno Rev3 ATmega16U2 as USB to Serial Converter ATmega16U2 ICSP When communicating via USART through RX and TX pins, they go to this processor and get converted to the USB protocol and vice versa. It can be toggled on or off by setting that pin to HIGH/LOW correspondingly.Īrduino Uno Rev3 LEDs Arduino Uno Rev3 LEDs USB To Serial ConverterĪrduino Uno Rev3 comes with a dedicated ATmega16U2 programmed to do the USB To Serial conversion.
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