Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Freescale Semiconductor/MK61F15WS/UART0/RIDT#0x0
UART CEA709.1-B Receive Indeterminate Time
CEA709.1-B Receive IDT register
https://github.com/cmsis-svd/cmsis-svd-data