48 MHz clock generation using external reference in KL17

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48 MHz clock generation using external reference in KL17

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felicita
Contributor II

Hi all,

We have designed our custom board with MKL17Z256VFM4, with 16 MHz external reference crystal.

Is it possible to generate 48 MHz using external reference clock?

Thank you!

Regards,

Felicita Mercy D.

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kerryzhou
NXP TechSupport
NXP TechSupport

Hi Felicita Mercy,

     No, you can't use the external 16Mhz crystal get 48Mhz core clock.

    Please refer to the KL17 reference manual:

pastedImage_1.png

    You can find the system oscillator input to the MCGOUTCLK with the CLKS choose, there has no PLL module, so the system oscillator just can be divided down, can't be doubled.

    But don't worry, if you want to use the 48Mhz core clock, you also can use the internal 48Mhz IRC.

Wish it helps you!

If you still have question, please let me know!


Have a great day,
Kerry

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1,411件の閲覧回数
kerryzhou
NXP TechSupport
NXP TechSupport

Hi Felicita Mercy,

     No, you can't use the external 16Mhz crystal get 48Mhz core clock.

    Please refer to the KL17 reference manual:

pastedImage_1.png

    You can find the system oscillator input to the MCGOUTCLK with the CLKS choose, there has no PLL module, so the system oscillator just can be divided down, can't be doubled.

    But don't worry, if you want to use the 48Mhz core clock, you also can use the internal 48Mhz IRC.

Wish it helps you!

If you still have question, please let me know!


Have a great day,
Kerry

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

1,410件の閲覧回数
felicita
Contributor II

Hi Kerry,

Thank you very much for clarifying.

We used internal 48MHz and it is working fine.

Regards,

Felicita Mercy D.

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