Hi,
I just reproduced your problem, it is because the current clock setting can't set accurate 115200 baud rate. if i set baud rate as 9600, it can work. see attached video baud rate 9600.mp4.
or if you need 115200 baud rate anyway, we can trim internal reference clock to 31.25. and set MCGOUT as 20M. it works for 115200 baud rate. see below screenshot. see attached video
can it help you?
Have a great day,
Zhang Jun
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