Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Freescale Semiconductor/MK21D5WS/CRC/DATA#0x0
CRC Data register
CRC Low Lower Byte
CRC Low Upper Byte
CRC High Lower Byte
CRC High Upper Byte
https://github.com/cmsis-svd/cmsis-svd-data