Using less Pins to connect a 3.2" LCD Display

i have simple yes/no question, here is:
so found lcd touch 3.2" display sd card slot. thing uses pins.
therefore sell these lcd shields arduino megas. read can read bitmaps sd card show them on screen. question now: can draw bitmaps via command , dont use data pins? have nano good. in (hopefully not wrong) world should able use command, touch, ground , vcc pins.
is correct?
thanks,
marius (pizzadejamon)

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