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USB controller data pins

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Ashford

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hey,
I have a USB controller IC an I've read the datasheet twice and I still don't quite understand what some pin are for. The datasheet can be found here

UT163_USB_CONTROLLER

The pins that I'm having problems understanding are the I/O pins, for instance what does it mean by "GPIO Bus - port 3 bit 2" for pin 8 or "Group 0 Flash Data Bus - bit 1" for pin 36? What I'm interested in knowing is what these pins are for or how they might be used.
 
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