TWI: SDA and SCL pins that are near to the AREF pin. IOREF: allows an attached shield with the proper configuration to adapt to the voltage provided by the board. This enables shield compatibility with a 3.3V board like the Due and AVRbased boards which operate at 5V. An unconnected pin reserved for future use....
A000062 - ARDUINO DUE
by NeweggConsumer Electronics
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