imxrt1061 set semc clock to 133Mhz

[MCW]

Hi all,

I find the default semc clock frequency is around 163Mhz in evkbmimxrt1060_semc sample code.

And the clock frequency is changed to about 109Mhz when I set the value of  kCLOCK_SemcDiv to 2.

However, I want to change the clock frequecny to 133Mhz.

So how could I reduce the semc clock to 133Mhz?

Best regards,

Doris

[mjbcswitzerland · Accepted solution]

Hi

You can achieve 132MHz SEMC_CLK_ROOT by removing the line CLOCK_InitSys_Pdf() [this leaves PLL2-PDF2 at its default value of 396MHz] or setting it to CLOCK_InitSys_Pdf(24).
and setting CLOCK_SetDiv(KClock_SemcDiv, 2).

For the explications see pages 20 and 5 of https://www.utasker.com/docs/iMX/i.MX_RT_1021_uTasker.pdf

Regards

Mark

For i.MX and Kinetis stock availability see https://www.utasker.com/Shop/semi.html

[MCW]

Hi @mjbcswitzerland ,

Thanks for your help.

The semc clock is set to 132Mhz now.

Best regards,

Doris