Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Fujitsu/S6E2CC/HSSPI/FIFOCFG#0x0
FIFO Setting Register
RX-FIFO threshold
TX-FIFO threshold
FIFO bit width setting value
TX-FIFO transmission data control bit
RX-FIFO clear bit
TX-FIFO clear bit
https://github.com/cmsis-svd/cmsis-svd-data