1. Re: XMEGA clocking questions (Graham Davies) > > Having taken the position that the crystal is not necessary, I should > probably qualify that by saying that I also agree with > David Kelly and Anthony Andriano and I do exactly what David suggests by > including a footprint for a 32.768 kHz crystal and then not populating it. > Partly this is in case the internal oscillator does turn out to be too far > off (hasn't happened yet) but also partly in case I (or my client) discover > a need to keep accurate wall-clock time in firmware. > > Graham. >
If you want 'accurate' clock time, don't forget the needed timmer cap for the 32kHz crystal. Simpler to trim to exact frequency than to do software correction for the inevitable error.
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