Robert Revens wrote:

Or maybe use mode 0 or 2, where the baud rate is fixed to 1/12 (mode 0) or 1/32 or 1/64 (mode2) of the main osc freq? If you were careful to choose the correct main osc, it may help.

Mode 0 is a shift register mode, it doesn't give start or stop bits, so it's probably not easy to make it work with a normal UART

Anders