2024-03-25 02:53 AM
Just came across this post:
which quotes AN2867 saying that MEMS oscillators are, "compatible with all STM32 MCUs/MPUs, except for the STM32F1 and STM32L1 series."
(my emphasis)
So what is it that makes the F1 and L1 unable to use MEMS oscillators?
2024-04-02 05:15 AM
This could be due to the maximum input rise and fall time. For the STM32F1, it is 50 ns as indicated in Table 21 of the datasheet. In a MEMS oscillator, it can reach up to 100 or 200 ns.
2024-04-02 05:58 AM
It would be good if AN2867 stated the reason(s) - rather than just dismissing the F1 and L1