AVR-Chat

I am thinking of migrating up from mega series to xmega.  It's not clear to
me, however, if you can still program them in the "traditional" ISP way.
There seems to be something called "PDI" now, but still using a 6-pin
connection.  It's pretty clear you can still do it through JTAG, so that's
not an issue.  I'd appreciate it if someone could explain in a nutshell PDI
vs old ISP.  Thanks, Steve.
 

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