pito:
..my strong feeling is the board needs an external RTC.. the idea running 1284p with the optional 32khz xtal @timer2 is nice, but when you start to work with it you will be soon unhappy not having the actual time ready anytime.. maybe to trade it for jtag and the prototyping area.. with a small dia coin cell it may fit, maybe..
I manage to add PFC8563T RTC with a 12mm coin cell. I guess it will last you for a long time. And there's some library around for that chip. As there's a 5V & 3.3V selection, the RTC needed to be able to operate on both voltage and PFC8563T fits that and didn't burn a hole in the pocket.
I'll stop here for the board! If any of you guys are interested, I'll post the CAD files probably on GitHub.
