On Fri, Oct 29, 2010 at 11:40 AM, Jesse Lackey
<jsl-ml@celestialaudio.com> wrote:

> However, according to 2.2.4, it seems that if I use a 4Mhz crystal,
> enable the PLL to get 96Mhz reference internally, I can then configure
> the divisor that creates the USB clock to be div by 2 for 48Mhz for
> full-speed USB, and then divisor for the microcontroller to be by 6 for
> 16Mhz (3V operation) or by 4 for 24Mhz (3.3V operation) and I'm set.

You are right here.

> I'm pretty confused. =A0Can anyone say exactly what is needed (xtal and
> osc config) to use full-speed USB @ 3V or 3.3V with this line of parts?
>

So you are not confused after all. The USB clock is at 48MHz
and the CPU clock is at 16MHz.

Some historical for this topic. I have not checked with the new
stack, but the old stack can run at the above settings.
http://www.microchip.com/forums/m275409.aspx


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Xiaofan

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