On Feb 17, 2013, at 14:54 , Bob Paddock <[email protected]> wrote:
> Same as you, could not find in the datasheet. > By the coloring of the pins PORTE.6 and PORTE.7 look like a good guess. > Designing by 'guess' is great, does make you wonder who writes these > datasheets. :-( > > Also be aware of this with XMega RTC: > > I was told by Atmel that you can not drive the RTC input with an > external oscillator, > unless you want to add power wasting bias network. > Kills the whole idea of using a temperature compensated 400 nA 32 kHz osc. > > Here is the official line via my FAE: > > "The optimal solution for the oscillator is to have TOSC2 at 1.2V and > let TOSC1 oscillate around this level. A small swing, ±0.2V, is better > than a large swing. Full swing (GND to VCC) is not guaranteed to be > stable." Wow. So many kinds of awful in that. I use the SPI port on Port E, which uses PE6 & 7. And as to the stability and power consumption, that's just horrible. Good thing this particular design doesn't need an RTC. I just like leaving room for one in all designs. -- Rick _______________________________________________ AVR-chat mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/avr-chat
