Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA6T1AD/SYSTEM/STCONR#0x0
STCON=00
Standby Condition Register
SSTBY condition bit
0 (00): set this value in case of transferring to Software Standby Mode in using HOCO.
3 (11): set this value in case of transferring to Software Standby Mode in using expect for HOCO.
https://github.com/cmsis-svd/cmsis-svd-data