yehudabch:
I know about normal arduino and no, of course I'm not using 1.84MHz, this is a frequency from the datasheet.
2.1% is a lot.
Depends, this is asyncronous communications after all, so what is the accepatable error ?
The receiver, based on the start bit transition, starts sampling in the middle of the bit, so assuming a further 10 bits to be sampled, what is the allowable frequency differance before the sampling gets to one of the bit edges ?