I am currently designing a shield that contains all my circuits and an accelerometer to run with my Arduino Uno board. However, I will also need to put an XBee shield on top of the shield I am designing (so the order is: bottom: Arduino Uno, middle: my PCB, top: XBee shield).
The XBee shield I am referring to is: http://ie.farnell.com/arduino/a000021/zigbee-mod-xbee-with-out-rf-mod/dp/1848697?Ntt=ARDUINO+-+A000021
My problem: I can't really find exact information about which pins the XBee shield actually uses. I know that it plugs to digital pins 0-7 and analog pins A0 - A5, but which pins other than RX and TX will actually be used by the shield?