Arduino Leonardo ETH: ATmega32U4, Ethernet, PoE Connector, uSD
... operates. A properly configured shield
can read the IOREF pin voltage and select the appropriate power source or
enable voltage translators on the outputs for working with the 5V or
Input ... Low to reset the microcontroller. Typically it is used to add a reset button to shields or
enclosures which block the one on the board.
See also the mapping between Arduino pins ...