Generating 120 Mhz - crystelless for k22 family

cancel
Showing results for 
Search instead for 
Did you mean: 

Generating 120 Mhz - crystelless for k22 family

105 Views
sreejithmenon
Contributor I

I am working with a mk22fn512cap , and wnated to run it at 120 MHz without using an external oscillator.

1) Since PLL are not connected to the internal sources I dont think I can use the internal ref clocks to get it upto 120?

2) So the option is to use IRC48M. in some posts I read that this is not stable and has some known errata..? Can someone tell me if using IRC48M is the correct/best way to get to run the controller to run at 120 Mhz.

Thanks,

Labels (1)
Tags (1)
0 Kudos
1 Reply

37 Views
mjbcswitzerland
Specialist V


Hi

See http://www.utasker.com/kinetis/MCG.html

There is no problem using the 48MHz IRC for 120MHz PLL operation. Just check the errata for your device to see whether it is affected by the one that requires the USB controller to be enabled to use it - this was only some of the first devices with IRC48M and has been corrected already in newer silicon.

Regards

Mark


Kinetis: http://www.utasker.com/kinetis.html
Kinetis K21/K22/K24:
- http://www.utasker.com/kinetis/TWR-K21D50M.html
- http://www.utasker.com/kinetis/TWR-K21F120M.html
- http://www.utasker.com/kinetis/FRDM-K22F.html
- http://www.utasker.com/kinetis/TWR-K22F120M.html
- http://www.utasker.com/kinetis/BLAZE_K22.html
- http://www.utasker.com/kinetis/tinyK22.html
- http://www.utasker.com/kinetis/TWR-K24F120M.html


Free Open Source solution: https://github.com/uTasker/uTasker-Kinetis
Working project in 15 minutes video: https://youtu.be/K8ScSgpgQ6M

For better, faster, cheaper product developments consider the uTasker developer's version, professional Kinetis support, one-on-one training and complete fast-track project solutions to set you apart from the herd : http://www.utasker.com/support.html

0 Kudos