"I seem to have a better understa..." <- > <@michael.desilva:matrix.org> I seem to have a better understanding now (RTFM!) and found this is stable > > ```rust > let mut pwrcfg = pwr.ldo().vos1().freeze(); > > let rcc = dp.RCC.constrain(); > let ccdr = rcc.sys_ck(100.MHz()).freeze(pwrcfg, &dp.SYSCFG); > ``` > > VOS1 is for normal operation up to 400Mhz, but 400Mhz is unstable for me. 100Mhz is fine. I also found this as a reference for vos0 https://github.com/stm32-rs/stm32h7xx-hal/blob/master/examples/vos0.rs and https://github.com/stm32-rs/stm32h7xx-hal/blob/master/examples/voltage_scaling.rs How much do you love H7 power and clocks