Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Freescale Semiconductor/MK61F15WS/SPI1/TXFR1#0x0
DSPI Transmit FIFO Registers
Transmit Data
Transmit Command or Transmit Data
https://github.com/cmsis-svd/cmsis-svd-data