topic Re: How to configure system core clock to its max frequency on MK22FN128VLL10? in Kinetis Microcontrollers

How to configure system core clock to its max frequency on MK22FN128VLL10?

sn2 — Fri, 30 May 2025 05:19:44 GMT

Dear team,

I am using template project from SDK v24.12 for MK22FN128 mcu. In this clock config is done using internal clock & bus clock i get 20.97Mhz. What is the max freq i can configure with internal clock & how to configure it.?

Thanks,

Re: How to configure system core clock to its max frequency on MK22FN128VLL10?

Alice_Yang — Tue, 03 Jun 2025 02:08:04 GMT

Hello @sn2

The core and system clock frequencies must be 100 MHz or slower in HSRUN, 72
MHz or slower in RUN. So please switch to HSRUN mode.

Alice

Re: How to configure system core clock to its max frequency on MK22FN128VLL10?

sn2 — Tue, 03 Jun 2025 08:56:26 GMT

Hi Alice_Yang
Can you share an example code for the same?

I am unable to get it for MK22FN128

Re: How to configure system core clock to its max frequency on MK22FN128VLL10?

Alice_Yang — Wed, 04 Jun 2025 02:25:23 GMT

Hi @sn2

I tested on my side. It can't reach 100 MHz, but it's almost 96 MHz. The configuration is as below:

Hope it helps.

Alice

Re: How to configure system core clock to its max frequency on MK22FN128VLL10?

sn2 — Wed, 04 Jun 2025 04:04:28 GMT

Hi @Alice_Yang

Can you share me the code changes for clock configuration, how you have done?

Re: How to configure system core clock to its max frequency on MK22FN128VLL10?

Alice_Yang — Wed, 04 Jun 2025 07:58:03 GMT

Hello @sn2

I'm sorry, but according to our company policy, I'm unable to share the code. However, this process is quite simple. Please refer to my configuration settings—especially the ones highlighted in the red box.

Then click update code button, the system will automatically generate the necessary code as below.

Alice