I am facing a problem with the clocks on the STM32H755ZI. When I let a timer run at 50 kHz I get only smt. like 49.92 kHz out of it with sigma = 13 Hz. So there is at any frequency a steady offset of -1.2% and a sigma deviation of 0.03%. I have chosen as HSE the Crystal/Ceramic Resonator and the APB2 of the timer runs at 200 kHz.
With the Nucleo 144 STM32F767ZI I get for similar settings basically 0% frequency offset and sigma deviation of only 0.0003%. So I am wondering what has changed between these discovery boards
they both have this X4 crystal at 25.000 MHz and several others.
So do you see any way how I can achieve a higher frequency stability? Or what I might have to change in CubeIDE to activate a more accurate crystal on the H755 board?
Thanks a lot for any help 🙂
Solved! Go to Solution.