Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Freescale Semiconductor/MK21D5WS/CRC/DATAL#0x0
CRC_DATAL register.
DATAL stores the lower 16 bits of the 16/32 bit CRC
https://github.com/cmsis-svd/cmsis-svd-data