ATmega8(L)
Table 61. Examples of UBRR Settings for Commonly Used Oscillator Frequencies (Continued)
fosc = 3.6864MHz fosc = 4.0000MHz
U2X = 0 U2X = 1 U2X = 0 U2X = 1
UBRR UBRR UBRR UBRR
fosc = 7.3728MHz
Baud
Rate
(bps)
U2X = 0
U2X = 1
UBRR
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%
-7.8ꢀ
-7.8ꢀ
–
Error
0.2%
0.2%
0.2%
2.1ꢀ
0.2%
-3.5ꢀ
-7.0ꢀ
8.5ꢀ
8.5ꢀ
8.5ꢀ
8.5ꢀ
0.0%
–
Error
0.2%
0.2%
0.2%
-0.8ꢀ
0.2%
2.1ꢀ
0.2%
-3.5ꢀ
-7.0ꢀ
8.5ꢀ
8.5ꢀ
0.0%
0.0%
–
UBRR
191
95
47
31
23
15
11
7
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
-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%
-7.8ꢀ
-7.8ꢀ
-7.8ꢀ
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
95
47
23
15
11
7
191
95
47
31
23
15
11
7
103
51
25
16
12
8
207
103
51
34
25
16
12
8
383
191
95
63
47
31
23
15
11
7
5
6
3
3
2
5
2
6
5
1
3
1
3
3
0
1
0
1
1
3
0
1
0
1
1
3
0.5M
–
0
–
0
0
1
1M
–
–
–
–
–
–
–
0
Max (1)
230.4kbps
UBRR = 0, Error = 0.0ꢀ
460.8kbps
250kbps
0.5Mbps
460.8kbps
921.6kbps
1.
154
2486AA–AVR–02/2013
ATMEL [ ATMEL ]
