Kinetis MicrocontrollersのトピックRe: KE06 48MHz operation

KE06 48MHz operation

davidsherman — Wed, 18 Jun 2014 17:24:14 GMT

I think I already know the answer to this, but it seems that in order to get 48 MHz operation from an external crystal, it is necessary to use a 9.6 MHz crystal, a 19.2 MHz crystal, or an external 48 MHz oscillator, is this correct? It doesn't appear that this is possible using an 8 MHz or 16 MHz crystal, which are readily available.

Re: KE06 48MHz operation

Jorge_Gonzalez — Thu, 19 Jun 2014 02:09:24 GMT

Hello David:

I think you are correct, the FLL reference clock divider and the fixed 1280 multiplication factor will not allow you to use 8 MHz or 16 MHz crystal. An alternative would be to use FEI mode and trimming the internal reference clock to 37500 Hz.

Regards!,
Jorge Gonzalez

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Re: KE06 48MHz operation

davidsherman — Fri, 20 Jun 2014 12:33:47 GMT

Thanks Jorge, I think that seems to be the case. I don't think the internal oscillator will be stable enough for the application I'm intending.