Hello,
Please accept my apologies for the delayed response.
In this case, I would like to recommend you the Kinetis Peripheral Module Quick Reference document in order to find the cause of your problem. More specifically the Chapter 12: Universal Asynchronous Receiver and Transmitter (UART) Module.
This document is a collection of code examples, useful tips, and quick reference material that have been created to help with the speed of the development of applications.
If you still have problems, please do not hesitate to reply this thread.
Please find the document mentioned above in the following link:
http://www.freescale.com/files/32bit/doc/quick_ref_guide/KQRUG.pdf
Hope this information will be useful for you.
Best Regards,
David Diaz.
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