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MCG specifications about "Δfdco_t"

Question asked by okubo hitoshi on Feb 4, 2014
Latest reply on Feb 4, 2014 by Jorge_Gonzalez

I am using a MK20FN1M0VLQ12 device.

I have the following questions:

 

In K20 Sub-Family Datasheet「Document Number K20P144M120SF3 Rev 5, 10/2013」

 

Q1.[6.3.1 MCG specifications Table 15. MCG specifications]

"Δfdco_t" is "typ ±4.5%fdco".

I understand that this spec is when using the (slow clock) internal reference.

Do I understand correctly?

 

Q2.about "Δfdco_t".

I want to use MCG in FLL mode using External clock from RTC OSC(32.768kHz ±20ppm).

Target DCO output frequency is 47.97MHz.

Other setting is below.

DMX32:1

DRST_DRS:01

 

In that case,

Do you tell me the spec of "Δfdco_t" ?

 

Thank you and Best regards.

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