
77
ATmega161(L)
1228C–AVR–08/02
Table 24. UBR Settings at Various Crystal Frequencies
Baud Rate
1MHz
%Error
1.8432 MHz
%Error
2MHz
%Error
2.4576 MHz
%Error
2400
UBR=
25 0.2
UBR=
47 0.0
UBR=
51 0.2
UBR=
63 0.0
4800
UBR=
12 0.2
UBR=
23 0.0
UBR=
25 0.2
UBR=
31 0.0
9600
UBR= 6 7.5 UBR=
11 0.0
UBR=
12 0.2
UBR=
15 0.0
14400
UBR= 3 7.8 UBR=
70.0
UBR= 8 3.7 UBR= 10 3.1
19200
UBR= 2 7.8 UBR=
50.0
UBR= 6 7.5 UBR=
70.0
28800
UBR= 1 7.8 UBR=
30.0
UBR= 3 7.8 UBR= 4 6.3
38400
UBR= 1 22.9 UBR=
20.0
UBR= 2 7.8 UBR=
30.0
57600
UBR= 0 7.8 UBR=
10.0
UBR= 1 7.8 UBR= 2 12.5
76800
UBR= 0 22.9 UBR= 1 33.3 UBR= 1 22.9 UBR=
10.0
115200
UBR= 0 84.3 UBR=
00.0
UBR= 0 7.8 UBR= 0 25.0
Baud Rate
3.2768 MHz
%Error
3.6864 MHz
%Error
4MHz
%Error
4.608 MHz
%Error
2400
UBR=
84 0.4
UBR=
95 0.0
UBR=
103 0.2
UBR=
119 0.0
4800
UBR=
42 0.8
UBR=
47 0.0
UBR=
51 0.2
UBR=
59 0.0
9600
UBR=
20 1.6
UBR=
23 0.0
UBR=
25 0.2
UBR=
29 0.0
14400
UBR=
13 1.6
UBR=
15 0.0
UBR= 16 2.1 UBR=
19 0.0
19200
UBR= 10 3.1 UBR=
11 0.0
UBR=
12 0.2
UBR=
14 0.0
28800
UBR=
61.6
UBR=
70.0
UBR= 8 3.7 UBR=
90.0
38400
UBR= 4 6.3 UBR=
50.0
UBR= 6 7.5 UBR= 7 6.7
57600
UBR= 3 12.5 UBR=
30.0
UBR= 3 7.8 UBR=
40.0
76800
UBR= 2 12.5 UBR=
20.0
UBR= 2 7.8 UBR= 3 6.7
115200
UBR= 1 12.5 UBR=
10.0
UBR= 1 7.8 UBR= 2 20.0
Baud Rate
7.3728 MHz
%Error
8MHz
%Error
9.216 MHz
%Error
11.059 MHz
%Error
2400
UBR=
191 0.0
UBR=
207 0.2
UBR=
239 0.0
UBR= 287 -
4800
UBR=
95 0.0
UBR=
103 0.2
UBR=
119 0.0
UBR=
143 0.0
9600
UBR=
47 0.0
UBR=
51 0.2
UBR=
59 0.0
UBR=
71 0.0
14400
UBR=
31 0.0
UBR=
34 0.8
UBR=
39 0.0
UBR=
47 0.0
19200
UBR=
23 0.0
UBR=
25 0.2
UBR=
29 0.0
UBR=
35 0.0
28800
UBR=
15 0.0
UBR= 16 2.1 UBR=
19 0.0
UBR=
23 0.0
38400
UBR=
11 0.0
UBR=
12 0.2
UBR=
14 0.0
UBR=
17 0.0
57600
UBR=
70.0
UBR= 8 3.7 UBR=
90.0
UBR=
11 0.0
76800
UBR=
50.0
UBR= 6 7.5 UBR= 7 6.7 UBR=
80.0
115200
UBR=
30.0
UBR= 3 7.8 UBR=
40.0
UBR=
50.0
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