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[on:]

I just bought NFC reader from: http://www.seeedstudio.com/wiki/NFC_Shield_V1.0
It is stated that: SPI interface. Hence, most Arduino pins are available for other applications
So can I still be used pin 9,10,11,12 for other bit transfer because it has already use SPI?
Or I cant?

Thank you!!!

[Reply #1 on:]

Pins 11, 12, and 13 are the SPI bus pins. You can connect more than one SPI device to those pins, as long as each has a different SS (slave select) pin. Pin 10 needs to be set as an OUTPUT pin (and otherwise not used, except possibly as a SS pin) to define that the Arduino is the SPI master.

You can use these pins to talk to any number of SPI devices, but not for other purposes while there is a SPI device in use.