I'm using the famous crystal of 11... Mhz.
Runing the chip in X1 all works fine, is not necesary select the 1/12 tosc etc (and the datasheet says that those bits don´t work on X1)
However the only way that i can select the right baudrate (56k) is selecting t1 and the uart as 1/12 clocks.
The question how to select the baud rate in X2 mode using 1/6 tosc (don´t works calculating like xtal of 22...Mhz)