Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Fujitsu/S6E1A1/MFS0/CSIO_ESCR#0x0
Extended Communication Control Register
Bit0-2 of Data length select bits
Data transmit/received wait select bits
Serial Chip Select Format enable bit
Bit3 of Data length select bits
Serial output pin set bit
https://github.com/cmsis-svd/cmsis-svd-data