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AT90SCR100 Datasheet(PDF) 254 Page - ATMEL Corporation

Part # AT90SCR100
Description  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 Datasheet(HTML) 254 Page - ATMEL Corporation

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254
TPR0327AY–SMS–30Jan09
AT90SCR100
18.12 Examples of Baud Rate Setting
For AT90SCR100 frequencies, the most commonly used baud rates for asynchronous operation
can be generated by using the UBRR settings in Table 18-9 and Table 18-10. UBRR values
which yield an actual baud rate differing less than 0.5% from the target baud rate, are bold in the
table. Higher error ratings are acceptable, but the Receiver will have less noise resistance when
the error ratings are high, especially for large serial frames (see “Asynchronous Operational
Range” on page 246). The error values are calculated using the following equation:
Note:
1. UBRR = 0, Error = 0.0%
Error[%]
BaudRateClosest Match
BaudRate
--------------------------------------------------------
1
–
⎝⎠
⎛⎞ 100%
•
=
Table 18-9.
Examples of UBRR0 Settings accessible Oscillator Frequencies
Baud
Rate
(bps)
f
osc = 8.0000 MHz
f
osc = 16 MHz
f
osc = 19.2 MHz
U2X0 = 0
U2X0 = 1
U2X0 = 0
U2X0 = 1
U2X0 = 0
U2X0 = 1
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
2400
207
0.2%
416
-0.1%
416
-0.1%
832
0%
499
0%
999
0%
4800
103
0.2%
207
0.2%
207
0.2%
416
-0.1%
249
0%
499
0%
9600
51
0.2%
103
0.2%
103
0.2%
207
0.2%
124
0%
249
0%
14.4k
34
-0.8%
68
0.6%
68
0.6%
138
-0.1%
82
0.4%
166
-0.2%
19.2k
25
0.2%
51
0.2%
51
0.2%
103
0.2%
62
-0.8%
124
0%
28.8k
16
2.1%
34
-0.8%
34
-0.8%
68
0.6%
41
-0.8%
82
0.4%
38.4k
12
0.2%250.2%250.2%51
0.2%300.8%62
-0.8%
57.6k
8
-3.5%
16
2.1%
16
2.1%
34
-0.8%
20
-0.8%
41
-0.8%
76.8k
6
-7%
12
0.2%
12
0.2%
25
0.2%
15
2.3%
30
0.8%
115.2k
3
8.5%
8
-3.5%
8
-3.5%
16
2.1%
9
4.2%
20
-0.8%
230.4k
1
8.5%
3
8.5%
3
8.5%
8
-3.5%
4
4.2%
9
4.2%
250k
1
0%
3
0%
3
0%
7
0%
4
-4%
9
-4%
500k
0
0%
1
0%
1
0%
3
0%
1
20%
4
-4%
1M
-
-
0
0%
0
0%
1
0%
0
20%
1
20%
1.5M
-----
-
0
33.3%
-
-%
1
-20%
2M
-----
-
0
0%
-
-%
0
20%
Max.(1)
500kbps
1Mbps
1Mbps
2Mbps
1.2Mbps
2.4Mbps



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