When using an external xtal/osc with an AVR, you get several startup time options when setting the fuses, such as:
- 6 CK/14 CK + 0 ms
- 6 CK/14 CK + 4 ms
- 6 CK/14 CK + 64 ms
Now... does anyone know if these startup times apply when resuming my AVR from sleep (SLEEP_MODE_PWR_DWN)? Or is it just when starting it for the first time. I want to use a 32.768 kHz watch crystal to keep accurate time, but it seems to me that if there are these startup time issues each and every time after going to sleep then that would make for very unreliable time-keeping.
Using an ATtiny85 if it makes any difference.