ATMEGA88V_14 Datasheet, PDF (198/377 Pages) ATMEL Corporation – High endurance non-volatile memory segments

ATmega48/88/168
Table 20-12. Examples of UBRRn settings for commonly used oscillator frequencies.
Baud
rate
(bps)
f_osc = 16.0000MHz
U2Xn = 0
U2Xn = 1
UBRRn Error UBRRn Error
f_osc = 18.4320MHz
U2Xn = 0
U2Xn = 1
UBRRn Error UBRRn Error
f_osc = 20.0000MHz
U2Xn = 0
U2Xn = 1
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
Max.⁽¹⁾
0
0.0%
1Mbps
1
0.0%
2Mbps
–
–
1.152Mbps
–
–
2.304Mbps
–
–
1.25Mbps
–
–
2.5Mbps
Note: 1. UBRRn = 0, error = 0.0%
2545T–AVR–05/11
198