Instruct the compiler to set a new baud rate at run time.
BAUD = var
The baud rate that you want to use.
var : Constant.
When you want to use a crystal/baud rate that can't be selected from the options, you can assign this special variable.
Do not confuse it with the $BAUD directive!
$BAUD = 2400
$CRYSTAL = 14000000 ' 14 MHz crystal
BAUD = 9600