Impulse 7205e - Manual (Page 23)

Baud Rates and Oscillator Value
The 7205e utilizes a 14.7456MHz oscillator, which is automatically entered by the
SeaCOM driver under Windows 2000/XP/Vista operating systems. The oscillator
value can be found in the COM port properties of Device Manager under the
‘Advanced Tab’.
The high-speed oscillator and the UART’s flexible clock prescaler support a wide
range of standard and non-standard baud rates. You simply need to select the
appropriate baud rate in your communications software and the driver will calculate
the closest matching baud rate.
When you use the board in other operating systems like Linux, the baud rate you
select is multiplied by eight resulting in the actual, faster baud rate. This allows the
board to achieve data rates to 921.6K bps.
The following table shows common baud rates and the baud rates you need to select
in your application running on operating systems other than Windows.
For this Data Rate Choose this Data Rate
1200 bps 150 bps
2400 bps 300 bps
4800 bps 600 bps
9600 bps 1200 bps
19.2K bps 2400 bps
38.4K bps 4800 bps
57.6K bps 7200 bps
115.2 K bps 14.4K bps
230.4K bps 28.8K bps
460.8K bps 57.6 K bps
921.6K bps 115.2 K bps
If your communications package allows the use of baud rate divisors, choose the
appropriate divisor from the following table:
For this Data Rate Choose this Divisor
1200 bps 768
2400 bps 384
4800 bps 192
9600 bps 96
19.2K bps 48
38.4K bps 24
57.6K bps 16
115.2K bps 8
230.4K bps 4
460.8K bps 2
921.6K bps 1
© Sealevel Systems, Inc. - 21 - COMM+2.LPCIe User Manual