I am planning a migration to this chip from dsPIC33F. I see the part on the Microchip site as an Atmel part. I downloaded Atmel Studio 7, but it is apparently not a supported chip??
Go to Tools->Device Pack Manager and download the device support (this device was release after the current studio release, so we haven't shipped a version of Studio yet with the device support bundled)
(yes, I work for Atmel, yes, I do this in my spare time, now stop sending PMs)
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