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參數(shù)資料
| 型號： | 935026920518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 2 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PQCC44 |
| 封裝： | PLASTIC, MO-047AC, SOT-187-2, LCC-44 |
| 文件頁數(shù)： | 10/34頁 |
| 文件大?。?/td> | 313K |
| 代理商： | 935026920518 |
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Philips Semiconductors
Product specification
SCN2681
Dual asynchronous receiver/transmitter (DUART)
1998 Sep 04
18
Table 3.
Bit Rate Generator Characteristics Crystal or Clock = 3.6864MHz
NORMAL RATE (BAUD)
ACTUAL 16x CLOCK (kHz)
ERROR (%)
50
0.8
0
75
1.2
0
110
1.759
-0.069
134.5
2.153
0.059
150
2.4
0
200
3.2
0
300
4.8
0
600
9.6
0
1050
16.756
-0.260
1200
19.2
0
1800
28.8
0
2000
32.056
0.175
2400
38.4
0
4800
76.8
0
7200
115.2
0
9600
153.6
0
14.4K
230.4
0
19.2k
307.2
0
28.8K
460.8
0
38.4k
614.4
0
57.6K
921.6
0
115.2K
1843.2K
0
NOTE: Duty cycle of 16x clock is 50%
± 1%.
Asynchronous UART communications can tolerate frequency error
of 4.1% to 6.7% in a “clean” communications channel. The percent
of error changes as the character length changes. The above
percentages range from 5 bits not parity to 8 bits with parity and one
stop bit. The error with 8 bits no parity and one stop bit is 4.6%. If a
stop bit length of 9/16 is used, the error tolerance will approach 0
due to a variable error of up to 1/16 bit time in receiver clock phase
alignment to the start bit.
Table 4.
ACR 6:4 Field Definition
ACR 6:4
MODE
CLOCK SOURCE
000
Counter
External (IP2)
001
Counter
TxCA – 1x clock of Channel A transmitter
010
Counter
TxCB – 1x clock of Channel B transmitter
011
Counter
Crystal or external clock (x1/CLK) divided by 16
100
Timer (square wave)
External (IP2)
101
Timer (square wave)
External (IP2) divided by 16
110
Timer (square wave)
Crystal or external clock (x1/CLK)
111
Timer (square wave)
Crystal or external clock (x1/CLK) divided by 16
NOTE: Timer mode generates a squarewave.
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