Datasheet

167
ATmega48/88/168 Automotive [DATASHEET]
7530K–AVR–07/14
Table 17-12. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies (Continued)
Baud
Rate
(bps)
f
osc
= 16.0000MHz f
osc
= 18.4320MHz f
osc
= 20.0000MHz
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 416 –0.1% 832 0.0% 479 0.0% 959 0.0% 520 0.0% 1041 0.0%
4800 207 0.2% 416 –0.1% 239 0.0% 479 0.0% 259 0.2% 520 0.0%
9600 103 0.2% 207 0.2% 119 0.0% 239 0.0% 129 0.2% 259 0.2%
14.4k 68 0.6% 138 –0.1% 79 0.0% 159 0.0% 86 –0.2% 173 –0.2%
19.2k 51 0.2% 103 0.2% 59 0.0% 119 0.0% 64 0.2% 129 0.2%
28.8k 34 –0.8% 68 0.6% 39 0.0% 79 0.0% 42 0.9% 86 –0.2%
38.4k 25 0.2% 51 0.2% 29 0.0% 59 0.0% 32 –1.4% 64 0.2%
57.6k 16 2.1% 34 –0.8% 19 0.0% 39 0.0% 21 –1.4% 42 0.9%
76.8k 12 0.2% 25 0.2% 14 0.0% 29 0.0% 15 1.7% 32 –1.4%
115.2k 8 –3.5% 16 2.1% 9 0.0% 19 0.0% 10 –1.4% 21 –1.4%
230.4k 3 8.5% 8 –3.5% 4 0.0% 9 0.0% 4 8.5% 10 –1.4%
250k 3 0.0% 7 0.0% 4 –7.8% 8 2.4% 4 0.0% 9 0.0%
0.5M 1 0.0% 3 0.0% – – 4 –7.8% – – 4 0.0%
1M 0 0.0% 1 0.0% – – – – – – – –
Max.
(1)
1Mbps 2Mbps 1.152Mbps 2.304Mbps 1.25Mbps 2.5Mbps
Note: 1. UBRRn = 0, error = 0.0%