MEGA128CAN Datasheet, PDF (196/413 Pages) ATMEL Corporation – Microcontroller WITH 128K BYTES OF ISP FLASH AND CAN CONTROLLER

Table 85. Examples of UBRRn Settings for Commonly Frequencies (Continued)
Baud
Rate
(bps)
fclk_io = 3.6864 MHz
U2Xn = 0
U2Xn = 1
UBRRn Error UBRRn Error
fclk_io = 4.0000 MHz
U2Xn = 0
U2Xn = 1
UBRRn Error UBRRn Error
fclk_io = 7.3728 MHz
U2Xn = 0
U2Xn = 1
UBRRn Error UBRRn Error
2400
95
0.0%
191
0.0%
103
0.2%
207
0.2%
191
0.0%
383
0.0%
4800
47
0.0%
95
0.0%
51
0.2%
103
0.2%
95
0.0%
191
0.0%
9600
23
0.0%
47
0.0%
25
0.2%
51
0.2%
47
0.0%
95
0.0%
14.4k
15
0.0%
31
0.0%
16
2.1%
34
-0.8%
31
0.0%
63
0.0%
19.2k
11
0.0%
23
0.0%
12
0.2%
25
0.2%
23
0.0%
47
0.0%
28.8k
7
0.0%
15
0.0%
8
-3.5%
16
2.1%
15
0.0%
31
0.0%
38.4k
5
0.0%
11
0.0%
6
-7.0%
12
0.2%
11
0.0%
23
0.0%
57.6k
3
0.0%
7
0.0%
3
8.5%
8
-3.5%
7
0.0%
15
0.0%
76.8k
2
0.0%
5
0.0%
2
8.5%
6
-7.0%
5
0.0%
11
0.0%
115.2k
1
0.0%
3
0.0%
1
8.5%
3
8.5%
3
0.0%
7
0.0%
230.4k
0
0.0%
1
0.0%
0
8.5%
1
8.5%
1
0.0%
3
0.0%
250k
0
-7.8%
1
-7.8%
0
0.0%
1
0.0%
1
-7.8%
3
-7.8%
500k
–
–
0
-7.8%
–
–
0
0.0%
0
-7.8%
1
-7.8%
1M
Max. ⁽¹⁾
–
–
230.4 kbps
–
–
460.8 kbps
–
–
250 kbps
–
–
0.5 Mbps
–
–
460.8 kpbs
0
-7.8%
921.6 kbps
1.
UBRRn = 0, Error = 0.0%
196 AT90CAN128
4250E–CAN–12/04