Kinetis K64 Ref clock output

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Kinetis K64 Ref clock output

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eduardrazumovsk
Contributor III

Hello,

Can i output a 24MHz clock from the MCU to other IC ? if so, what are the restrictions ?

MK64FN1M0VDC12 is connected to USB HUB, i want to save the cost of 24MHz crystal required by the USB HUB

Best Regards

1 Solution
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Jorge_Gonzalez
NXP Employee
NXP Employee

Hello Eduard Razumovsky:

It might be possible to use the FTM (FlexTimer) to get a 24 MHz clock. See these similar threads:

Re: Unable to get PWM to work with ext crystal-only configuration

Re: What components do I need to output PWM using FTM module by Processor Expert ?

How could I output 50MHz square waveform by using FRDM-K64F?

BUT, for a USB HUB this would be really not recommended. USB specifications and timings are very strict. So it should be of course better to use an oscillator or crystal.

Regards!

Jorge Gonzalez

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2 Replies
708 Views
eduardrazumovsk
Contributor III

Thanks a lot Jorge

Regards

Eduard

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709 Views
Jorge_Gonzalez
NXP Employee
NXP Employee

Hello Eduard Razumovsky:

It might be possible to use the FTM (FlexTimer) to get a 24 MHz clock. See these similar threads:

Re: Unable to get PWM to work with ext crystal-only configuration

Re: What components do I need to output PWM using FTM module by Processor Expert ?

How could I output 50MHz square waveform by using FRDM-K64F?

BUT, for a USB HUB this would be really not recommended. USB specifications and timings are very strict. So it should be of course better to use an oscillator or crystal.

Regards!

Jorge Gonzalez