I'm looking at the Ethernet Arduino datasheet here;
And in the first section it says the pins 10, 11, 12, and 13 are reserved for the ethernet communications.
Than down in the Input/Ouput section is says that those same pins can be used for SPI communications.
I'd like to use this board with a MCP23S17 so I can use the MCP library which emulates regular port writing on the Arduino. Is this possible on the ethernet Arduino (I have a rev 3 board)? What about using the ICSP pins? Can I just repurpose those pins to be MOSI/MISO/SS/SCK for the MCP library, if so, how would I go about doing that?
Thanks in advance.