For the STM32G031 and STM32G030 (maybe other G0 mcu too) there is an errata:
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2.5.5 TIM16 and TIM17 are unduly clocked by SYSCLK
Description
The timers TIM16 and TIM17 are unduly clocked by SYSCLK instead of being clocked by the timer clock
TIMPCLK. As a consequence, they do not reflect AHB and APB prescaler settings.
The TIM16 and TIM17 are fully functional as long as the SYSCLK-to-PCLK frequency ratio remains smaller than
or equal to four.
This fact is not taken into account, so in my project the frequency of timer TIM17 is set incorrectly, when I set the STM32_PPRE bigger then 2.
