Pins 0 and 1 are connected to the corresponding pins of the ATmega16U2 Serial chip. Serial 3 15 RX and 14 TX Used to receive RX and transmit TX TTL serial data with. ![]() In addition, some pins have specialized functions: They also have an internal resistor disconnected by default of 100 KOhm. Each pin can provide source a current of 3 mA or 15 mA, depending on the pin, or receive sink a current of 6 mA or 9 mA, depending on the pin.
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