ATMEGA128L-8MC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATMEGA128L-8MC' PDF : 395 Pages View PDF
Table 83. Examples of UBRR Settings for Commonly Used Oscillator Frequencies
Baud
Rate
(bps)
fosc = 3.6864 MHz
U2X = 0
U2X = 1
UBRR Error UBRR Error
fosc = 4.0000 MHz
U2X = 0
U2X = 1
UBRR Error UBRR Error
2400
95
0.0%
191
0.0%
103
0.2%
207
0.2%
4800
47
0.0%
95
0.0%
51
0.2%
103
0.2%
9600
23
0.0%
47
0.0%
25
0.2%
51
0.2%
14.4k
15
0.0%
31
0.0%
16
2.1%
34
-0.8%
19.2k
11
0.0%
23
0.0%
12
0.2%
25
0.2%
28.8k
7
0.0%
15
0.0%
8
-3.5%
16
2.1%
38.4k
5
0.0%
11
0.0%
6
-7.0%
12
0.2%
57.6k
3
0.0%
7
0.0%
3
8.5%
8
-3.5%
76.8k
2
0.0%
5
0.0%
2
8.5%
6
-7.0%
115.2k
1
0.0%
3
0.0%
1
8.5%
3
8.5%
230.4k
0
0.0%
1
0.0%
0
8.5%
1
8.5%
250k
0
-7.8%
1
-7.8%
0
0.0%
1
0.0%
0.5M
–
–
0
-7.8%
–
–
0
0.0%
1M
Max (1)
–
–
230.4 kbps
–
–
460.8 kbps
–
–
250 kbps
–
–
0.5 Mbps
1.
UBRR = 0, Error = 0.0%
fosc = 7.3728 MHz
U2X = 0
U2X = 1
UBRR Error UBRR Error
191
0.0%
383
0.0%
95
0.0%
191
0.0%
47
0.0%
95
0.0%
31
0.0%
63
0.0%
23
0.0%
47
0.0%
15
0.0%
31
0.0%
11
0.0%
23
0.0%
7
0.0%
15
0.0%
5
0.0%
11
0.0%
3
0.0%
7
0.0%
1
0.0%
3
0.0%
1
-7.8%
3
-7.8%
0
-7.8%
1
-7.8%
–
–
0
-7.8%
460.8 kbps
921.6 kbps
196 ATmega128
2467O–AVR–10/06
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