topic Re: k20D50 clock output pin in Kinetis Microcontrollers

k20D50 clock output pin

mjg8t — Wed, 18 Mar 2015 22:47:23 GMT

Hi There,

I am trying to find the best resource on the MK20DN128VFM5 to output the fastest clock possible.

I do not see any direct "clkout" pins on this device?

I have found this thread that talks about using the flex_bus clk (this device does not have flexbus) and trace_out (this pin is not labeled in the datasheet).

https://community.freescale.com/message/318385#318385

Any ideas?

Re: k20D50 clock output pin

Jorge_Gonzalez — Thu, 19 Mar 2015 00:48:12 GMT

Hello M J:

I just checked the manual and datasheet for K20_50MHz parts and it seems that the CLKOUT pin is not documented, sorry for this misunderstanding.

However it should be present as ALT5 of the pin PTC3. You can configure the SIM_SOPT2[CLKOUTSEL] field to select between different internal clocks.

Regards!,
Jorge Gonzalez

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Re: k20D50 clock output pin

Amit_Kumar1 — Thu, 19 Mar 2015 03:50:40 GMT

HI M J

As Jorge mentioned You can configure it for PTC3 if you want for RTC you can map the PTE0 for RTC_CLKOUT.

The following settings for SIM_SOPT2[CLKOUTSEL].

Hope It helps.

Regards

Amit

Re: k20D50 clock output pin

mjg8t — Thu, 19 Mar 2015 15:13:07 GMT

Thank you for the feedback.

Long live Kinetis (I hope).