SAMG55 - Clocking USB UDP from internal 32kHz RC oscillator

Discussion around product based on ARM Cortex M4 core.
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motison
Posts: 4
Joined: Thu Nov 05, 2015 6:35 pm

SAMG55 - Clocking USB UDP from internal 32kHz RC oscillator

Wed Dec 30, 2015 12:16 pm

Hi,

Is it possible to get the 48MHz UDP clock from a PLL that uses the internal 32kHz RC as its source (with a 1500 mutliplier)?

I have tried it on the SAMG55 Xplained Pro and some UDP examples (e.g. CDC) that worked just fine with the on-board 32.768kHz crystal stopped working once I switched to the internal RC

Thanks,
Moti
tsvoipio
Posts: 54
Joined: Wed Aug 19, 2015 9:44 pm

Re: SAMG55 - Clocking USB UDP from internal 32kHz RC oscilla

Wed Dec 30, 2015 10:57 pm

The frequency tolerance of the RC oscillator is not good enough for USB.

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-TV
motison
Posts: 4
Joined: Thu Nov 05, 2015 6:35 pm

Re: SAMG55 - Clocking USB UDP from internal 32kHz RC oscilla

Thu Dec 31, 2015 9:53 am

OK,

Thanks TV!

Moti

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