Hello Harold,
(1) The kineits L series produces support the maximum volt is 3.3V,
so we can not use the 12v volt , must under 3.3 v.
About the wakeup sources , you can check it at the reference manual :

(2) About use the Processor Expert on CW, when you create project , please select it

Then about add one button , you can use the GPIO interrupt . So you can add the component
of "GPIO_LDD" component , then configure it refer to your requirement , about the usage example
of this component ,you can refer to the "Typical Usage":

If i misunderstand something, please tell me without any hesitate .
Hope it hleps
Have a great day,
Alice
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