Datasheet
98
ATmega323(L)
1457E–11/01
Table 36. Examples of UBRR Settings for Commonly Used Oscillator Frequencies –
UBRR = 0, Error = 0.0%
Baud
Rate
(bps)
f
osc
= 1.0000 MHz f
osc
= 1.8432 MHz
U2X = 0 U2X = 1 U2X = 0 U2X = 1
UBRR Error UBRR Error UBRR Error UBRR Error
2400 25 0.2% 51 0.2% 47 0.0% 95 0.0%
4800 12 0.2% 25 0.2% 23 0.0% 47 0.0%
9600 6 -7.0% 12 0.2% 11 0.0% 23 0.0%
14.4K 3 8.5% 8 -3.5% 7 0.0% 15 0.0%
19.2K 2 8.5% 6 -7.0% 5 0.0% 11 0.0%
28.8K 1 8.5% 3 8.5% 3 0.0% 7 0.0%
38.4K 1 -18.6% 2 8.5% 2 0.0% 5 0.0%
57.6K 0 8.5% 1 8.5% 1 0.0% 3 0.0%
76.8K ––1 -18.6% 1 -25.0% 2 0.0%
115.2K ––0 8.5% 0 0.0% 1 0.0%
230.4K ––––––00.0%
250K ––––––––
Max
62.5 Kbps 125 Kbps 115.2 Kbps 230.4 Kbps
Baud
Rate
(bps)
f
osc
= 2.0000 MHz f
osc
= 3.6864 MHz
U2X = 0 U2X = 1 U2X = 0 U2X = 1
UBRR Error UBRR Error UBRR Error UBRR Error
2400 51 0.2% 103 0.2% 95 0.0% 191 0.0%
4800 25 0.2% 51 0.2% 47 0.0% 95 0.0%
9600 12 0.2% 25 0.2% 23 0.0% 47 0.0%
14.4K 8 -3.5% 16 2.1% 15 0.0% 31 0.0%
19.2K 6 -7.0% 12 0.2% 11 0.0% 23 0.0%
28.8K 3 8.5% 8 -3.5% 7 0.0% 15 0.0%
38.4K 2 8.5% 6 -7.0% 5 0.0% 11 0.0%
57.6K 1 8.5% 3 8.5% 3 0.0% 7 0.0%
76.8K 1 -18.6% 2 8.5% 2 0.0% 5 0.0%
115.2K 0 8.5% 1 8.5% 1 0.0% 3 0.0%
230.4K ––––00.0%10.0%
250K ––0 0.0% 0 -7.8% 1 -7.8%
1M ––0-7.8%
Max 125 Kbps 250 Kbps 230.4 Kbps 460.8 Kbps