i.MX RT1050 : external clock

[giuseppescarpi]

Hello everybody! I am a newbie with the community and with i.MX as well.

I'd like to start with a (hopefully) simple question about RT1050. The datasheet always refers to an external 24 MHz clock. Although this frequency is defined as "typical" or "suggested", I can't understand if you can use a different value, say 24.576 MHz.

For example,it seems to me that both 480 MHz for USB and 25 MHz for ETH use fixed PLL that rely on a 24 MHz Xtal.

Suggestions?

Thanks

Giuseppe

[igorpadykov · Accepted solution]

Hi Giuseppe

yes this undersatnding is correct, in general one can try to

adjust plls values appropriately using formula in sect.18.6.1.3 PLL reference clock,

sect.18.8 CCM Analog Memory Map/Register Definition i.MX RT1050 Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMXRT1050RM.pdf

Best regards
igor
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