> Is this doable with a PIC or ATXMEGA chip?

Hi David

The refresh rate will be too fast (ie a very low duty cycle per column)
for a really bright display by direct drive. You can use latches to hold
the data. I've serviced displays which were split into halves or quarters
with a micro for each.

This one I made manages a 200Hz refresh rate quite comfortably
even with a modestly slow PIC. There's plenty of time for graphics
or effects, more so if a newer, faster PIC was used

http://home.clear.net.nz/pages/joecolquitt/message.html

Driver ICs (eg ULN200x) could be used instead of transistors

Joe


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