Atmel ATmega128

197
2467S–AVR–07/09
ATmega128
Table 85. Examples of UBRR Settings for Commonly Used Oscillator Frequencies
Baud
Rate
(bps)
f
osc
= 16.0000 MHz
U2X = 0 U2X = 1
UBRR Error UBRR Error
2400 416 -0.1% 832 0.0%
4800 207 0.2% 416 -0.1%
9600 103 0.2% 207 0.2%
14.4k 68 0.6% 138 -0.1%
19.2k 51 0.2% 103 0.2%
28.8k 34 -0.8% 68 0.6%
38.4k 25 0.2% 51 0.2%
57.6k 16 2.1% 34 -0.8%
76.8k 12 0.2% 25 0.2%
115.2k 8 -3.5% 16 2.1%
230.4k 3 8.5% 8 -3.5%
250k 3 0.0% 7 0.0%
0.5M 1 0.0% 3 0.0%
1M 0 0.0% 1 0.0%
Max
(1)
1 Mbps 2 Mbps
1. UBRR = 0, Error = 0.0%