/* relates crystal freq to baud rate - see above and PIC16F87x data sheet under 'USART async. modes'
BRGH=1, Fosc=3.6864MHz BRGH=1, Fosc=4MHz BRGH=1, Fosc=8MHz BRGH=1, Fosc=16MHz
---------------------- ----------------- ----------------- ------------------
Baud SPBRG Baud SPBRG Baud SPBRG Baud SPBRG
1200 191 1200 207.3 1200 415.7 9600 103
2400 95 2400 103.2 2400 207.3 19200 51
4800 47 4800 51.1 4800 103.2 38400 25
9600 23 9600 25.0 9600 51.1 57600 16
19200 11 19200 12.0 19200 25.0 115200 8
38400 5 38400 5.5 38400 12.0
57600 3 57600 3.3 57600 7.7
115200 1 115200 1.2 115200 3.3
*/