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Development Group
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JP, 28.March 2000
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- Knowledge of this table is usefull if there is trouble when trying
to communicate between different interfaces. If you enter a special
bitrate at a terminal application (or something else) the nearest possible
bitrate will be choosen. These could be different rates!
- The table is based on a generic formula, which is the same for all
devices using the 16Cx50 family UARTs. They require a clock which is
16 times higher than the bitrate.
- The max. bitrate at Twister (22.1184 Mhz X-TAL) would be 1,382,400
BPS which is too much for the transceiver chip used. An additional register
controls a clock divider which supports 16 bit natural numbers (0..65535).
- Using this calculation there are natural values and fractional values
for the bitrate. The fractional values were replaced with a bar on some
entries.
- If the fractional number was close enough to an "important"
value the deviation from that value was entered.
- Attention: Modems and ISDN-TAs usually support "autobaud".
This is not supported at higher rates. For Zyxel-OMNI you'll have to
do a manual selection at that device if you like to go beyond 460,800
BPS.
- Any rate lower than 9600 has got a continiously decreasing deviation
of 0.7%.
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Divider
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Bitrate (kBPS)
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0
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not supported
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1
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not supported
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2
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691.200
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3
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460.800
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4
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345.600
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5
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276.480
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6
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230.400
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7
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--
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8
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172.800
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9
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153.600
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10
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138.240
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11
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--
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12
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115.200
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13
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--
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14
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100.000 (1.3%) deviation
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15
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92.160
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16
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86.400
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17
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--
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18
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76.800
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19
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--
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Divider
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Bitrate (kBPS)
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20
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69.120
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21
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--
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22
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64.000 (1.8% deviation)
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23
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--
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24
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57.600
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25
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55.296
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26
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--
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27
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51.200
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28
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--
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29
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48.000 (0.7% deviation)
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30
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46.080
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31
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--
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32
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43.200
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33
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--
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34
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--
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35
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--
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36
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38.400
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37
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--
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38
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--
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39
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--
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Divider
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Bitrate (kBPS)
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40
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34.560
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41
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33.600 (0.4% deviation)
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42
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--
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43
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32.400 (0.8% deviation)
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44
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--
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45
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30.720
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46
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--
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47
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--
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48
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28.800
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49
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--
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50
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27.648
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51
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--
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52
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--
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53
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--
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54
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25.600
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55
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--
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56
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--
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57
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--
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58
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--
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59
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--
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Divider
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Bitrate (kBPS)
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60
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23.040
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64
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21.600
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72
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19.200
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75
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18.432
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80
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17.280
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82
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16.800 (0.3% deviation)
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90
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15.360
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96
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14.400
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144
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9.600
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...
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...
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