I want to use the Atmel Studio for programming the zero, so far so good but I struggle to generate the proper clock. If I only use the internal Clock the Core will run on 8Mhz.
If I use the "Fractional Digital Phase Locked Loop" to drive the Generic Clock Generator 0 (which drives the Core) I can achieve 48Mhz. But which reference Clock source do I use for the Fractional Digital Phase Locked Loop? The 32khz external crystal?
Or Do I just have to crank up the internal Crystal to 48Mhz by reducing the Oscillator Division Selector from 0xb to 0?
Is this correct (using the Locked Loop) ? https://www.dropbox.com/s/xr7tep3i6zginyl/image_clock.png