Let me reiterate, the LCD and touch screen use all of the available I/O of an ATmega328 based Arduino (Uno and similar) except for the serial (D0 and D1) and A4 and A5 if available… The wiki link clearly shows this.
In order to use this display with anything else, you will either need a larger Arduino (i.e., Mega) or two Unos connected to each other using the available serial lines.