Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32MG24A120F1536GM48/CMU_S/PCNT0CLKCTRL#0x0
CLKSEL=DISABLED
No Description
Clock Select
0 (DISABLED): PCNT0 is not clocked
1 (EM23GRPACLK): EM23GRPACLK is clocking PCNT0
2 (PCNTS0): External pin PCNT_S0 is clocking PCNT0
https://github.com/cmsis-svd/cmsis-svd-data