i.MX RT Crossover MCUsのトピックRe: IMXRT1024 CCM Clock Observability Output

IMXRT1024 CCM Clock Observability Output

Lukas_Frank — Wed, 30 Jun 2021 06:55:47 GMT

Hi all,

I am on my project to do configurations of clock connections. I did not fully understand function of CCM_CLKO1 and CCM_CLKO2 signals.

Reference Manual says :

14.2.1 Features
Selects clock signals to output on CCM_CLKO onto the pads for observability.

What observability means us here? For example I have two active clock that I used in my system (i.e. GPT and QTMR) at the same time. What kind of things will I observe from these CCM signals (CCM_CLKO1 and CCM_CLKO2)

Thanks and Regards.

Re: IMXRT1024 CCM Clock Observability Output

jeremyzhou — Thu, 01 Jul 2021 03:35:20 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1）What observability means us here? For example I have two active clock that I used in my system (i.e. GPT and QTMR) at the same time. What kind of things will I observe from these CCM signals (CCM_CLKO1 and CCM_CLKO2)
-- Just as the below figure shows, we can select some clock sources to output via the CCM_CLKO1 and CCM_CLKO2 pins, then use the oscilloscope to observe them.

jeremyzhou_0-1625110440384.png

Hope it helps.
Have a great day,
TIC

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Re: IMXRT1024 CCM Clock Observability Output

Lukas_Frank — Thu, 01 Jul 2021 06:32:42 GMT

Hi Dear @jeremyzhou ,

Q1: What if there is not a Clock Observability Output? So, what is the advantages of it? What kind of parameters are exist that we can observe from oscilloscope?

Q2: Which document and program did you use to see that figure?

Thanks and Regards.

Re: IMXRT1024 CCM Clock Observability Output

jeremyzhou — Fri, 02 Jul 2021 07:31:03 GMT

Hi,
Thanks for your reply.
Q1: What if there is not a Clock Observability Output? So, what is the advantages of it? What kind of parameters is exist that we can observe from an oscilloscope?
-- After mentioned above, we can select some clock sources to output via the CCM_CLKO1 and CCM_CLKO2 pins, then use the oscilloscope to observe them check their frequency is the expected value.
Q2: Which document and program did you use to see that figure?
Hope it helps.
-- The above figure is the screenshot of the MCUXpresso Config Tools which provides a graphical representation of the MCU clock tree system and interactive user controls as well as assistance with system fine-tuning.
Have a great day,
TIC

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