Resolved! Fractional mode register changes need a delay?
I'm trying to change the PLLxFRACR on-the fly. Per the reference manual something like this should work:__HAL_RCC_PLL2FRACN_DISABLE(); __HAL_RCC_PLL2FRACN_CONFIG(8191); __HAL_RCC_PLL2FRACN_ENABLE();On a STM32H750 this code seems to have no effect. Bu...