The equation is on page 59 of the Microconverter handbook. If you use timer2 and 12.5829 Mhz core clock the values in the in the timer register are:
RCAP2H = FF
RCAP2L = AE
The equation is:
Modes 1 & 3 Baud Rate = (Core Clock)/(32 X [65536-(RCAP2H,RCAP2L)]
Hope this helps,
Lonnie