Rainbow Electronics ATmega128RFA1 - Manual (Page 366)

366
8266A-MCU Wireless-12/09
ATmega128RFA1
f OSC = 1.8432 MHz f OSC = 2.0000 MHz f OSC = 3.6864 MHz
U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1
Baud
Rate
(bps)
UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error
57.6k 1 0.0% 3 0.0% 1 8.5% 3 8.5% 3 0.0% 7 0.0%
76.8k 1 -25.0% 2 0.0% 1 -18.6% 2 8.5% 2 0.0% 5 0.0%
115.2k 0 0.0% 1 0.0% 0 8.5% 1 8.5% 1 0.0% 3 0.0%
230.4k - - 0 0.0% - - - - 0 0.0% 1 0.0%
250k - - - - - - 0 0.0%% 0 -7.8% 1 -7.8%
Max.
(1)
115.2 kbps 230.4 kbps 125 kbps 250 kbps 230.4 kbps 460.8 kbps
Notes: 1. UBRR = 0, Error = 0.0%
Table 23-15. Examples of UBRRn Settings for Commonly Used Oscillator Frequencies (Continued)
f
OSC
= 4.0000 MHz f
OSC
= 7.3728 MHz f
OSC
= 8.0000 MHz
U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1 U2Xn = 0 U2Xn = 1
Baud
Rate
(bps)
UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error UBRR Error
2400 103 0.2% 207 0.2% 191 0.0% 383 0.0% 207 0.2% 416 -0.1%
4800 51 0.2% 103 0.2% 95 0.0% 191 0.0% 103 0.2% 207 0.2%
9600 25 0.2% 51 0.2% 47 0.0% 95 0.0% 51 0.2% 103 0.2%
14.4k 16 2.1% 34 -0.8% 31 0.0% 63 0.0% 34 -0.8% 68 0.6%
19.2k 12 0.2% 25 0.2% 23 0.0% 47 0.0% 25 0.2% 51 0.2%
28.8k 8 -3.5% 16 2.1% 15 0.0% 31 0.0% 16 2.1% 34 -0.8%
38.4k 6 -7.0% 12 0.2% 11 0.0% 23 0.0% 12 0.2% 25 0.2%
57.6k 3 8.5% 8 -3.5% 7 0.0% 15 0.0% 8 -3.5% 16 2.1%
76.8k 2 8.5% 6 -7.0% 5 0.0% 11 0.0% 6 -7.0% 12 0.2%
115.2k 1 8.5% 3 8.5% 3 0.0% 7 0.0% 3 8.5% 8 -3.5%
230.4k 0 8.5% 1 8.5% 1 0.0% 3 0.0% 1 8.5% 3 8.5%
250k 0 0.0% 1 0.0% 1 -7.8% 3 -7.8% 1 0.0% 3 0.0%
0.5M - - 0 0.0% 0 -7.8% 1 -7.8% 0 0.0% 1 0.0%
1M - - - - - - 0 -7.8% - - 0 0.0%
Max. (1) 250 kbps 0.5 Mbps 460.8 kbps 921.6 kbps 0.5 Mbps 1 Mbps
Notes: 1. UBRR = 0, Error = 0.0%