Kinetis MK66, how overclock to 240Mhz

[luishs]

Hi.

I want to apply overclock to a Kinetis MK66, to run at 240Mhz, I know it is possible because with the Teensy 3.6 I can apply an overclock at 192, 216 and 240Mhz, using the same microcontroller.

But I prefer to work with MCUXpresso, the problem is that I don't know how to configure it here, I have tried several combinations of the PLL but it always gives me error. The only sure  is that the maximum frequency of the VCO is 360Mhz according with the datasheet.

Regards

[mjbcswitzerland]

Hi

See this post showing the settings that are required: http://www.utasker.com/forum/index.php?topic=2044.0

However be aware of the fact that the processor is operating out of spec. as stated there:

"That is, it should only be used for personal hobby projects and not when there can be liability issues in professional work that could, in the worst case, result in the developer being sued for knowingly risking the end product or end users (think about the Toyota case where they knowingly risked using too little RAM which resulted in 89 deaths due to their electric accelerator blocking and the subsequently billions of dollars of fines and compensations: https://www.youtube.com/watch?v=NCTf7wT5WR0 )"

I don't expect the MCUXpresso configuration tools to allow it since they are catering also for professional work. Teensduino caters primarily for hobbyists who get a kick out of doing that shouldn't be done....;-)

Regards

Mark

Complete Kinetis solutions for professional needs, training and support: http://www.utasker.com/kinetis.html

Kinetis K66:
- http://www.utasker.com/kinetis/TWR-K65F180M.html
- http://www.utasker.com/kinetis/FRDM-K66F.html
- http://www.utasker.com/kinetis/TEENSY_3.6.html
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https://community.nxp.com/thread/512558

[luishs]

Thanks Mark.

So overclock means modifying the frequency of the VCO ?, to exceed 360Mhz which would be the limit officially supported by the device. I set the VCO to 480Mhz, so that the divider by 2 that comes next gives us 240Mhz for the core. Maybe I just apply a more moderate overclock, at 192Mhz.

I understand that MCUXpresso does not allow to do so, only by directly editing the source code could be done.