Table 87. Examples of UBRRn Settings for Commonly Frequencies (Continued)
fclkio = 12.0000 MHz
fclkio = 14.7456 MHz
fclkio = 16.0000 MHz
Baud
Rate
U2Xn = 0
U2Xn = 1
U2Xn = 0
UBRRn Error
U2Xn = 1
U2Xn = 0
UBRRn Error
U2Xn = 1
(bps) UBRRn Error
UBRRn Error
UBRRn Error
UBRRn Error
2400
4800
312
155
77
51
38
25
19
12
9
-0.2%
0.2%
0.2%
0.2%
0.2%
0.2%
-2.5%
0.2%
-2.7%
-8.9%
11.3%
0.0%
–
624
312
155
103
77
51
38
25
19
12
6
0.0%
383
191
95
63
47
31
23
15
11
7
0.0%
767
383
191
127
95
63
47
31
23
15
7
0.0%
416
207
103
68
51
34
25
16
12
8
-0.1%
832
416
207
138
103
68
51
34
25
16
8
0.0%
-0.2%
0.2%
0.2%
0.2%
0.2%
0.2%
0.2%
-2.5%
0.2%
-8.9%
0.0%
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%
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%
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%
-0.1%
0.2%
-0.1%
0.2%
0.6%
0.2%
-0.8%
0.2%
2.1%
-3.5%
0.0%
0.0%
0.0%
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
6
2
3
3
2
5
3
6
3
7
500k
–
2
1
3
1
3
1M
–
–
–
0
1
0
1
Max. (1)
750 kbps
UBRRn = 0, Error = 0.0%
1.5 Mbps
921.6 kbps
1.8432 Mbps
1 Mbps
2 Mbps
1.
198
AT90CAN128
4250E–CAN–12/04
ATMEL [ ATMEL ]
