ATmega8(L)
Table 63. Examples of UBRR Settings for Commonly Used Oscillator Frequencies (Continued)
fosc = 16.0000MHz fosc = 18.4320MHz
U2X = 0 U2X = 1 U2X = 0 U2X = 1
UBRR UBRR UBRR UBRR
fosc = 20.0000MHz
Baud
Rate
(bps)
U2X = 0
U2X = 1
UBRR
Error
-0.1%
0.2%
0.2%
0.6ꢀ
0.2%
-0.8ꢀ
0.2%
2.1ꢀ
0.2%
-3.5ꢀ
8.5ꢀ
0.0%
0.0%
0.0ꢀ
Error
0.0%
-0.1%
0.2%
-0.1%
0.2%
0.6ꢀ
0.2%
-0.8ꢀ
0.2%
2.1ꢀ
-3.5ꢀ
0.0%
0.0%
0.0ꢀ
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
-7.8ꢀ
–
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
2.4ꢀ
-7.8ꢀ
–
UBRR
520
259
129
86
64
42
32
21
15
10
4
Error
0.0%
0.2%
0.2%
-0.2%
0.2%
0.9ꢀ
-1.4ꢀ
-1.4ꢀ
1.7ꢀ
-1.4ꢀ
8.5ꢀ
0.0%
–
Error
0.0%
0.0%
0.2%
-0.2%
0.2%
-0.2%
0.2%
0.9ꢀ
-1.4ꢀ
-1.4ꢀ
-1.4ꢀ
0.0%
0.0%
–
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
416
207
103
68
51
34
25
16
12
8
832
416
207
138
103
68
51
34
25
16
8
479
239
119
79
59
39
29
19
14
9
959
479
239
159
119
79
59
39
29
19
9
1041
520
259
173
129
86
64
42
32
21
3
4
10
3
7
4
8
4
9
0.5M
1
3
–
4
–
4
1M
0
1
–
–
–
–
–
–
Max (1)
1Mbps
UBRR = 0, Error = 0.0ꢀ
2Mbps
1.152Mbps
2.304Mbps
1.25Mbps
2.5Mbps
1.
156
2486AA–AVR–02/2013
ATMEL [ ATMEL ]
