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Hey look, it's that board again!

This time there are some subtle differences:

* 16MHz crystal instead of 20MHz, to make generating the 48MHz usb clock easier

* button for RST pin, for those cases where you program code to engaged a bad clock and the debugger can't break in automatically. (oops)

* UART Debugging

* Nested interrupt system working :)

* USB in progress. Ported my USB stack from a very similar chip, but still some random failures that I'm digging through.

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Taken on January 8, 2012