SPI: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS). These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language. The SPI pins are also broken out on the ICSP header, which is physically compatible with the Duemilanove and Diecimila.
E' normale, l'arduino comunica con il chip ethernet w5100 con il protocollo spi, se usi i pin della spi come uscite o ingressi generici crei un conflitto.Alberto
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