AT90PWM2/3/2B/3B
Table 18-11. Examples of UBRR Settings for Commonly Frequencies (Continued)
fclkio = 10.000 MHz
U2X = 0 U2X = 1
UBRR UBRR
fclkio = 8.0000 MHz
U2X = 0 U2X = 1
UBRR UBRR
fclkio = 11.0592 MHz
Baud
Rate
(bps)
U2X = 0
UBRR
U2X = 1
UBRR
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
0.2%
0.2%
0.2%
0.9%
-1.4%
-1.4%
1.8%
-1.5%
1.9%
9.6%
-16.8%
-33.3%
–
Error
0.0%
0.2%
0.2%
0.2%
0.2%
0.9%
-1.4%
-1.4%
1.8%
-1.5%
9.6%
0.0%
-33.3%
–
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%
–
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
207
103
51
34
25
16
12
8
416
207
103
68
51
34
25
16
12
8
259
129
64
42
32
21
15
10
7
520
259
129
86
64
42
32
21
15
10
4
287
143
71
47
35
23
17
11
8
575
287
143
95
71
47
35
23
17
11
5
6
3
4
5
1
3
2
2
1
3
2
4
2
5
500k
0
1
–
2
–
2
1M
–
0
–
–
–
–
–
–
Max. (1)
0.5 Mbps
UBRR = 0, Error = 0.0%
1 Mbps
625 kbps
1.25 Mbps
691.2 kbps
1.3824 Mbps
1.
209
4317J–AVR–08/10
ATMEL [ ATMEL ]
