I am porting one of my projects from an AVR circa 2003 to a more recent offering, the D20/D21. Most everything in the datasheet makes complete sense and I'm very excited to get started, with one exception.
Section 6.1 Multiplexed Signals has a column for SERCOM (C) and SERCOM-ALT (D).
I'm really unclear what is the distinction between the two. When I looked at the datasheet for the D21 Xplained, the pin assignments on the expansion headers bounce between either definitions. This leads me to believe that the assignment is user selectable (very cool!) but if so, I have not been able to find a reference to that in the register section of the D20 or D21 datasheet.
Maybe this will make more sense once the Xplained gets here, but I'm jumping the gun and am very excited.
Discussions around product based on ARM Cortex M0+ core.
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