Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Microchip Technology/ATSAMV71J20/PWM0/PWM_CH_NUM[3]/CPRDUPD#0x0
PWM Channel Period Update Register (ch_num = 0)
Channel Period Update
https://github.com/cmsis-svd/cmsis-svd-data