Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA2A1AB/SDADC24/CLBSTR#0x0
CLBST=0
Calibration Start Control Register
Calibration start control
0 (0): Disable writing
1 (1): Start calibration
These bits are read as 0000000. The write value should be 0000000.
https://github.com/cmsis-svd/cmsis-svd-data