SERPER

          This register contains the control bit LONG reffered to
          above, and a 15 bit number defining the serial port
          Baud rate. If this number is N,then the baud rate is
          1 bit every (N+1)*.2794 microseconds.


   +-------+----------+---------------------------------------------------+
   | BIT#  | FUNCTION | DESCRIPTION                                       |
   +-------+----------+---------------------------------------------------+
   | 15    | LONG     | Defines serial receive as 9 bit word.             |
   | 14-00 | PERIOD   | Defines baud rate [=1/((N+1)*.2794 microseconds)] |
   +-------+----------+---------------------------------------------------+


          If you know the Baud Rate, you may calculate period
          for it with following formula:


                             3579546
                 PERIOD = ------------- - 1
                            BAUD RATE


          Periods for some most common baud rates are:


                   +-----------+--------+
                   | Baud Rate | Period |
                   +-----------+--------+
                   |    300    | 11931  |
                   |    600    |  5965  |
                   |   1200    |  2982  |
                   |   2400    |  1490  |
                   |   4800    |   745  |
                   |   9600    |   372  |
                   |  14400    |   248  |
                   |  28800    |   123  |
                   +-----------+--------+