Must USB clock source be 48MHz clock on USB-KW24D512?

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Must USB clock source be 48MHz clock on USB-KW24D512?

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luwan
Contributor II


Can this 20~25MHz clock after start-up be used for driving USB driver?

If 20~25MHz is not large enough, can we scale the clock to 48MHz via configuring MCG_C4, but still keep running in FEI mode?

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miduo
NXP Employee
NXP Employee

Hi,

No, you can not do that. The USB clock should be 48MHz and as I had mentioned that we do not recommend to use FLL to clock the USB.

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