Table 22-11. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies (Continued)
fosc = 8.0000 MHz fosc = 11.0592 MHz fosc = 14.7456 MHz
U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1
UBRR UBRR UBRR UBRR UBRR UBRR
Baud
Rate
(bps)
Error
0.2%
0.2%
0.2%
-0.8%
0.2%
2.1%
0.2%
-3.5%
-7.0%
8.5%
8.5%
0.0%
0.0%
–
Error
-0.1%
0.2%
0.2%
0.6%
0.2%
-0.8%
0.2%
2.1%
0.2%
-3.5%
8.5%
0.0%
0.0%
0.0%
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
-7.8%
–
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
-7.8%
-7.8%
–
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
-7.8%
-7.8%
-7.8%
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
5.3%
-7.8%
-7.8%
2400
4800
207
103
51
34
25
16
12
8
416
207
103
68
51
34
25
16
12
8
287
143
71
47
35
23
17
11
8
575
287
143
95
71
47
35
23
17
11
5
383
191
95
63
47
31
23
15
11
7
767
383
191
127
95
63
47
31
23
15
7
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
6
3
5
1
3
2
3
1
3
2
5
3
6
0.5M
0
1
–
2
1
3
1M
–
0
–
–
–
0
1
Max. (1)
0.5 Mbps
UBRR = 0, Error = 0.0%
1 Mbps
691.2 kbps
1.3824 Mbps
921.6 kbps
1.8432 Mbps
1.
230
ATmega640/1280/1281/2560/2561
2549L–AVR–08/07
ATMEL [ ATMEL ]
