參數(shù)資料
型號(hào)： OX16CF950
廠商： Electronic Theatre Controls, Inc.
英文描述： LOW COST ASYNCHRONOUS 16 BIT CARD
中文描述： 低成本異步16位卡
文件頁(yè)數(shù)： 39/60頁(yè)
文件大?。?/td> 753K
代理商： OX16CF950
Page 39
OXCF950 DATA SHEET V1.1
OXFORD SEMICONDUCTOR LTD.
TCR[3:0]
Clock cycles per bit
0000 to 0011
0100 to 1111
16
4-15
Table 33: TCR Sample Clock Configuration
The use of 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.
Error from
1.8432MHz
(%)
TCR = 16
0.00
115,200
0.00
460,800
0.00
921,600
0.00
1,152,000
0.08
2,000,000
0.16
2,062,500
0.22
2,500,000
0.01
3,125,000
2.13
3,750,000
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
Max. Baud rate
with CPR = 1,
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 (1.000)
0x20(4.000)
0x80 (8.000)
0x50 (10.000)
0x8B(17.375)
0x8F (17.875)
0xAE (21.750)
0xD9 (27.125)
0xFF (31.875)
Table 34: Example clock options and their assosiacted maximum baud rates
System Clock (MHz)
18.432
1.152M
Sampling
Clock
TCR
Value
1.8432
115,200
122,880
131,657
7.372
460,750
491,467
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
263,314 1,053,143 2,106,514 2,633,143 4,571,429 5,714,286 7,142,857 8,571428
307,200 1,228,667 2,457,600 3,072,000 5,333,333 6,666,667 8,333,333
368,640 1,474,400 2,949,120 3,686,400
460,800 1,843,000 3,686,400 4,608,000
14.7456
921,600
983,040 1,228,800 2,133,333 2,666,667 3,333,333
32
40
50
60
16
15
14
13
12
11
10
9
8
7
6
5
4
0x00
0x0F
0x0E
0x0D 141,785
0x0C 153,600
0x0B
167,564
0x0A
184,320
0x09
204,800
0x08
230,400
0x07
0x06
0x05
0x04
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 35: Maximum Baud Rates Available at all ‘TCR’ Sampling Clock Values
6.10.4 Input Clock Options
A system clock must be applied to XTLI pin on the device.
The speed of this clock determines the maximum baud rate
at which the device can receive and transmit serial data.
This maximum is equal to one sixteenth of the frequency of
the system clock (Increasing to one quarter of this value if
TCR=4 is used).
The industry standard system clock for PC COM ports is
1.8432 MHz, limiting the maximum baud rate to 115.2
Kbps. The OXCF950 supports system clocks up to 60MHz
at 5V or 50 MHz at 3.3V and its flexible baud rate
generation hardware means that almost any frequency can
be optionally scaled down for compatibility with standard
devices.
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