參數(shù)資料
型號(hào)： CD1284
廠商： Intel Corp.
英文描述： IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
中文描述： 符合IEEE 1284兼容并行接口控制器兩個(gè)高速異步串行端口
文件頁數(shù)： 103/176頁
文件大?。?/td> 2255K
代理商： CD1284
IEEE 1284-Compatible Parallel Interface Controller
—
CD1284
Datasheet
103
return(0);
}
6.7
Baud Rate Tables
Table 22
through
Table 26
indicate the values to be loaded into the RCOR/RBPR and TCOR/TBPR
to set the designated baud rate when using five standard frequency crystals.
Table 22
uses a 25-
MHz frequency;
Table 23
uses a 20.2752-MHz frequency, which yields near-perfect bit rates.
Table
24
uses a 20-MHz frequency and shows error rates that are larger although still well within the
limits set by the various standards covering asynchronous communications.
Table 25
also uses
another standard communications base frequency (18.432 MHz) that yields divisors with nearly
zero errors overall. However, since this frequency is below 20 MHz, performance at the higher
baud rates (76.8K and above) may be slightly lower and rates above 76.8K are
not
recommended.
Table 26
shows divisors for the lowest recommended operating frequency, 16 MHz.
Note:
It is not necessary that both the receiver and transmitter of a channel be programmed to the same
baud rate; the CD1284 can send and receive at different rates on the same channel.
Table 22. Baud Rate Constants
—
CLK = 25 MHz
Baud Rate
R/TCOR
1
R/TBPR (Hex)
Error
110
4
6F
0.02%
150
4
51
0.47%
300
3
A3
0.15%
600
3
51
0.47%
1200
2
A3
0.15%
2400
2
51
0.47%
4800
1
A3
0.15%
9600
1
51
0.47%
19200
0
A3
0.15%
38400
0
51
0.47%
56000
0
38
0.35%
57600
0
36
0.47%
64000
0
31
0.35%
76800
0
29
0.76%
115200
0
1B
0.47%
128000
0
18
1.70%
150000
0
15
0.80%
NOTE:
1. In this and the following tables, R/T is used as a register abbreviation indicating Receive/
Transmit, followed by the register acronym.
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