202
7679H–CAN–08/08
AT90CAN32/64/128
Note: 1. UBRRn = 0, Error = 0.0%
Table 17-11. Examples of UBRRn Settings for Commonly Frequencies (Continued)
Baud
Rate
(bps)
fclk
io
= 8.0000 MHz fclk
io
= 10.000 MHz fclk
io
= 11.0592 MHz
U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1
UBRRn Error UBRRn Error UBRRn Error UBRRn Error UBRRn Error UBRRn Error
2400 207 0.2% 416 -0.1% 259 0.2% 520 0.0% 287 0.0% 575 0.0%
4800 103 0.2% 207 0.2% 129 0.2% 259 0.2% 143 0.0% 287 0.0%
9600 51 0.2% 103 0.2% 64 0.2% 129 0.2% 71 0.0% 143 0.0%
14.4k 34 -0.8% 68 0.6% 42 0.9% 86 0.2% 47 0.0% 95 0.0%
19.2k 25 0.2% 51 0.2% 32 -1.4% 64 0.2% 35 0.0% 71 0.0%
28.8k 16 2.1% 34 -0.8% 21 -1.4% 42 0.9% 23 0.0% 47 0.0%
38.4k 12 0.2% 25 0.2% 15 1.8% 32 -1.4% 17 0.0% 35 0.0%
57.6k 8 -3.5% 16 2.1% 10 -1.5% 21 -1.4% 11 0.0% 23 0.0%
76.8k 6 -7.0% 12 0.2% 7 1.9% 15 1.8% 8 0.0% 17 0.0%
115.2k 3 8.5% 8 -3.5% 4 9.6% 10 -1.5% 5 0.0% 11 0.0%
230.4k 1 8.5% 3 8.5% 2 -16.8% 4 9.6% 2 0.0% 5 0.0%
250k 1 0.0% 3 0.0% 2 -33.3% 4 0.0% 2 -7.8% 5 -7.8%
500k 0 0.0% 1 0.0% – – 2 -33.3% – – 2 -7.8%
1M ––00.0%––––––––
Max.
(1)
0.5 Mbps 1 Mbps 625 Kbps 1.25 Mbps 691.2 Kbps 1.3824 Mbps
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