參數(shù)資料
型號(hào)： OX16PCI954
廠商： Electronic Theatre Controls, Inc.
英文描述： Integrated Quad UART and PCI interface
中文描述： 綜合四UART和PCI接口
文件頁(yè)數(shù)： 45/72頁(yè)
文件大?。?/td> 656K
代理商： OX16PCI954
values in bits-per-second (bps) that are obtained if the
divisor latch = 0x01 and the Prescaler is set to 1.
The OX16PCI954 has the facility to operate at baud-rates
up to 15 Mbps in normal mode.
Table 26 indicates how the value in the register
corresponds to the number of clock cycles per bit. TCR[3:0]
is used to programthe clock. TCR[7:4] are unused and will
return “0000” if read.
TCR[3:0]
Data Sheet Revision 1.3
Page 45
OX16PCI954
OXFORD SEMICONDUCTOR LTD.
Clock cycles per bit
0000 to 0011
0100 to 1111
16
4-15
Table 26: TCR Sample Clock Configuration
Use of the TCR does not require the device to be in 650 or
950 mode although only drivers that have been written to
take advantage of the 950 mode features will be able to
access this register. Writing 0x01 to the TCR will not switch
the device into 1x isochronous mode, this is explained in
the following section. (TCR has no effect in isochronous
mode). If 0x01, 0x10 or 0x11 is written to TCR the device
will operate in 16x mode.
Reading TCR will always return the last value that was
written to it irrespective of mode of operation.
Clock
Frequency
(MHz)
1.8432
7.3728
14.7456
18.432
32.000
33.000
40.000
50.000
60.000
CPR value
Effective
crystal
frequency
1.8432
1.8432
1.8432
1.8432
1.8417
1.8462
1.8391
1.8433
1.8824
Error from
1.8432MHz
(%)
0.00
0.00
0.00
0.00
0.08
0.16
0.22
0.01
2.13
Max. Baud rate
with CPR = 1,
TCR = 16
115,200
460,800
921,600
1,152,000
2,000,000
2,062,500
2,500,000
3,125,000
3,750,000
Max. Baud rate
with CPR = 1,
TCR = 4
460,800
1,843,200
3,686,400
4,608,000
8,000,000
8,250,000
10,000,000
12,500,000
15,000,000
0x08 (1)
0x20 (4)
0x40 (8)
0x50 (10)
0x8B (17.375)
0x8F (17.875)
0xAE (21.75)
0xD9 (27.125)
0xFF (31.875)
Table 27: Example clock options and their associated maximum baud rates
System Clock (MHz)
18.432
1.152M
Sampling
Clock
TCR
Value
1.8432
7.372
14.7456
921,600
983,040 1,228,800 2,133,333 2,666,667 3,333,333
526,571 1,053,257 1,316,571 2,285,714 2,857,143 3,571,429 4,285,714
567,077 1,134,277 1,417,846 2,461,538 3,076,923 3,846,154 4,615,384
614,333 1,228,800 1,536,000 2,666,667 3,333,333 4,166,667
670,182 1,340,509 1,675,636 2,909,091 3,636,364 4,545,455 5,454545
737,200 1,474,560 1,843,200
3.20M
819,111 1,638,400 2,048,000 3,555,556 4,444,444 5,555,556 6,666,667
921,500 1,843,200 2,304,000
4.00M
0x07 263,314 1,053,143 2,106,514 2,633,143 4,571,429 5,714,286 7,142,857 8,571428
0x06 307,200 1,228,667 2,457,600 3,072,000 5,333,333 6,666,667 8,333,333
0x05 368,640 1,474,400 2,949,120 3,686,400
0x04 460,800 1,843,000 3,686,400 4,608,000
32
40
50
60
16
15
14
13
12
11
10
9
8
7
6
5
4
0x00 115,200
0x0F 122,880
0x0E 131,657
0x0D 141,785
0x0C 153,600
0x0B 167,564
0x0A 184,320
0x09 204,800
0x08 230,400
460,750
491,467
2.00M
2.50M
3.125M
3.75M
4.00M
5.00M
4.00M
5.00M
6.00M
5.00M
6.25M
7.50M
10.00M
12.00M
15.00M
6.40M
8.00M
8.00M
10.00M
10.00M
12.50M
Table 28: Maximum Baud Rates Available at all ‘TCR’ Sampling Clock Values
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