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81C17 Datasheet(PDF) 7 Page - SMSC Corporation

Part # 81C17
Description  TWENTY PIN UART (TPUART)
Download  18 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

81C17 Datasheet(HTML) 7 Page - SMSC Corporation

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7
THE ON CHIP BAUD RATE GENERATOR
The TPUART incorporates an on chip Baud
Rate Generator that can be programmed to
generate sixteen of the most popular baud rates.
The TPUART also allows the bypassing of the
Baud Rate Generator by programming Mode
Register bit 3 to accept a 16X external clock.
The Baud Rate Generator will not assume any
given baud rate upon power up, therefore it
must be programmed as desired. The following
chart is based on a 5.0688 MHz CLOCK
frequency.
Table 2 - 16X CLOCK
Clock Frequency = 5.0688 MHz
Baud Rate
Select Register
Baud
Rate
Theoretical
Frequency
16X Clock
Actual
Frequency
16X Clock
Percent
Error
Duty
Cycle %
Divisor
D3
D2
D1
D0
0
0
0
0
50
0.8 kHz
0.8 kHz
50/50
6336
0
0
0
1
110
1.76
1.76
50/50
2880
0
0
1
0
134.5
2.152
2.1523
0.016
50/50
2356
0
0
1
1
150
2.4
2.4
50/50
2112
0
1
0
0
300
4.8
4.8
50/50
1056
0
1
0
1
600
9.6
9.6
50/50
528
0
1
1
0
1200
19.2
19.2
50/50
264
0
1
1
1
1800
28.8
28.8
50/50
176
1
0
0
0
2000
32.0
32.081
0.253
50/50
158
1
0
0
1
2400
38.4
38.4
50/50
132
1
0
1
0
3600
57.6
57.6
50/50
88
1
0
1
1
4800
76.8
76.8
50/50
66
1
1
0
0
7200
115.2
115.2
50/50
44
1
1
0
1
9600
153.6
153.6
48/52
33
1
1
1
0
19.200
307.2
316.8
3.125
50/50
16
1
1
1
1
38.400
614.4
633.6
3.125
50/50
8


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