Hi Damon,
1. non volatile storage
Please go to page 636, Program Flash IFR Map, there just has 64 program once field.
If you want to use the unique serial number, the K50 has the Unique Identification Register, it contains the chip UID.
2. FlexRAM
You can find just MK50DX256CMC10 has the flexNVM and the FlexRAM, your chip is MK50DN512CMC10, it just has the Program flash.
So, if the 64bits IFR is not enough, you may use the flash to store your configuration information.
Wish it helps you!
Have a great day,
Jingjing
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------