Datasheet

228
2549O–AVR–05/12
ATmega640/1280/1281/2560/2561
Note: 1. UBRR = 0, Error = 0.0%
57.6K 0 8.5% 1 8.5% 1 0.0% 3 0.0% 1 8.5% 3 8.5%
76.8K – – 1 -18.6% 1 -25.0% 2 0.0% 1 -18.6% 2 8.5%
115.2K – – 0 8.5% 0 0.0% 1 0.0% 0 8.5% 1 8.5%
230.4K – – – – – – 0 0.0% – – – –
250K––––––––––00.0%
Max.
(1)
62.5Kbps 125Kbps 115.2Kbps 230.4Kbps 125Kbps 250Kbps
Table 22-9. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies (Continued)
Baud
Rate
(bps)
f
osc
= 1.0000MHz f
osc
= 1.8432MHz f
osc
= 2.0000MHz
U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1
UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error