Hi Arti D,
The system clock and bus clock is enabled in default.
Do you mean how to choose bus clock as the ADC clock source?
Actually, you can refer to the FRDM-KE02 sample code:
FRDM-KEXX Driver Library Package
You can refer to KEXX_DRIVERS_V1.2.1_DEVD\kexx_drv_lib\build\iar\ke02\ADC_Int_demo, this code is using the bus clock as the ADC clock source.
ADC_SC3[ADICLK]=00 : bus clock.
About the problem of default_isr, did you debug it step by step? which code will caused it? you can post your code, it will help us to check it.
Have a great day,
Jingjing
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------