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How do I get L432KC SYSCLK to run at 80MHz?

Question asked by Colin Norris on Oct 11, 2017
Latest reply on Oct 18, 2017 by Clive One



I have a L432KC Nucleo 32 and it never runs as fast as I expect it to.


I have configured the clocks in STM32CubeMX as shown in my attached screenshot. I've configured MCO to match the SYSCLK so I can measure it with my oscilloscope.


According to STM32CubeMX, the SYSCLK should be 80MHz, but when I measure it with my oscilloscope, it's only 8MHz. If I change some things (e.g. use HSI RC instead of MSI RC) then I can get different speeds, but they never match the value shown in STM32CubeMX.


My only guess is that this being a low power version of STM32, does it work in some kind of low power mode with a lower clockspeed by default? If so, how do I get it out of that?


Thanks for your help,