Hi ruiye,
After test the bubble example in SDK_2.2_TWR-K24F120M with IAR , I didn't find this problem on TWR-K24F120M.
Have you try to test the examples in SDK_2.2_TWR-K24F120M?
If the outside circuit of System oscillator is different from TWR-K24F120M, you can create new configuration based on SDK by using MCUXpresso Config Tools.


Best Regards,
Robin
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