Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Fujitsu/S6E1A1/MFT_PPG/PPGC1#0x0
PPG Operation Mode Control Register 1
PPG Operation Mode Set bits
PPG DOWN Counter Operation Clock Select bits
Interrupt Mode Select bit
PPG Counter Underflow bit
PPG Interrupt Enable bit
https://github.com/cmsis-svd/cmsis-svd-data