Table 109. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies (Continued)
fosc = 16.0000 MHz fosc = 18.4320 MHz fosc = 20.0000 MHz
U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1
UBRR UBRR UBRR UBRR UBRR UBRR
Baud
Rate
(bps)
Error
-0.1ꢀ
0.2ꢀ
0.2ꢀ
0.6ꢀ
0.2ꢀ
-0.8ꢀ
0.2ꢀ
2.1ꢀ
0.2ꢀ
-3.5ꢀ
8.5ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
Error
0.0ꢀ
-0.1ꢀ
0.2ꢀ
-0.1ꢀ
0.2ꢀ
0.6ꢀ
0.2ꢀ
-0.8ꢀ
0.2ꢀ
2.1ꢀ
-3.5ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
Error
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
-7.8ꢀ
–
Error
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
0.0ꢀ
2.4ꢀ
-7.8ꢀ
–
Error
0.0ꢀ
0.2ꢀ
0.2ꢀ
-0.2ꢀ
0.2ꢀ
0.9ꢀ
-1.4ꢀ
-1.4ꢀ
1.7ꢀ
-1.4ꢀ
8.5ꢀ
0.0ꢀ
–
Error
0.0ꢀ
0.0ꢀ
0.2ꢀ
-0.2ꢀ
0.2ꢀ
-0.2ꢀ
0.2ꢀ
0.9ꢀ
-1.4ꢀ
-1.4ꢀ
-1.4ꢀ
0.0ꢀ
0.0ꢀ
–
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
520
259
129
86
64
42
32
21
15
10
4
1041
520
259
173
129
86
64
42
32
21
3
4
10
3
7
4
8
4
9
0.5M
1M
1
3
–
4
–
4
0
1
–
–
–
–
–
–
Max. (1)
1 Mbps
UBRR = 0, Error = 0.0ꢀ
2 Mbps
1.152 Mbps
2.304 Mbps
1.25 Mbps
2.5 Mbps
1.
230
ATmega640/1280/1281/2560/2561
2549A–AVR–03/05
ATMEL [ ATMEL ]
