We have a board where we use PTA18 as gpi pin, we muxed it correctly and signal is read correctly from that pin. But after couple of changing pin input logic levels, the baudrate in uarts is changed (we are using two uarts and both of them show wrong baudrate on scope).
System clock was FLL from internal 32kHz.
Now we setup system to use external 32kHz crystal, and this works.
But this issue is not addressed to as far as we can see in forum or in errate.