ATMEGA163 ATMEL [ATMEL Corporation], ATMEGA163 Datasheet - Page 77

• Manufacturer Part Number: ATMEGA163
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Table 27. UBR Settings at Various Crystal Frequencies
1142E–AVR–02/03
Baud R ate
2400
4800
9600
14400
19200
28800
38400
57600
76800
11520 0
Baud R ate
2400
4800
9600
14400
19200
28800
38400
57600
76800
11520 0
Baud R ate
2400
4800
9600
14400
19200
28800
38400
57600
76800
11520 0
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
UBR=
3,28 MHz % Error
7,37 MHz % Error
1 MHz % Error
191
25
12
84
42
20
13
10
95
47
31
23
15
11
6
3
2
1
1
0
0
0
6
4
3
2
1
7
5
3
•
For standard crystal frequencies, the most commonly used baud rates can be generated
by using the UBR settings in Table 27. UBR values which yield an actual baud rate dif-
fering less than 2% from the target baud rate, are bold in the table. However, using baud
rates that have more than 1% error is not recommended. High error ratings give less
noise resistance.
Note that this equation is not valid when the UART transmission speed is doubled.
See “Double Speed Transmission” on page 78 for a detailed description.
22,9 U BR =
22,9 U BR =
84,3 U BR =
12,5 U BR =
12,5 U BR =
12,5 U BR =
0,2 U BR =
0,2 U BR =
7,5 U BR =
7,8 U BR =
7,8 U BR =
7,8 U BR =
7,8 U BR =
0,4 U BR =
0,8 U BR =
1,6 U BR =
1,6 U BR =
3,1 U BR =
1,6 U BR =
6,3 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
0,0 U BR =
1,84 MHz % Erro r
3,69 MHz % Erro r
8 MHz % Erro r
2 07
1 03
47
23
11
95
47
23
15
11
51
34
25
16
12
7
5
3
2
1
1
0
7
5
3
2
1
8
6
3
33 ,3 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,0 U BR =
0 ,2
0 ,2
0 ,2
0 ,8
0 ,2
2 ,1
0 ,2
3 ,7
7 ,5
7 ,8
2 MHz
4 MHz
103
51
25
12
51
25
16
12
8
6
3
2
1
1
0
8
6
3
2
1
% Error
% Error
2 2,9 U BR =
0,2 U BR =
0,2 U BR =
0,2 U BR =
3,7 U BR =
7,5 U BR =
7,8 U BR =
7,8 U BR =
7,8 U BR =
7,8 U BR =
0,2 U BR =
0,2 U BR =
0,2 U BR =
2,1 U BR =
0,2 U BR =
3,7 U BR =
7,5 U BR =
7,8 U BR =
7,8 U BR =
7,8 U BR =
2,458 MHz % Error
4,608 MHz % Error
ATmega163(L)
119
63
31
15
10
59
29
19
14
7
4
3
2
1
0
9
7
4
3
2
1 2,5
2 5,0
2 0,0
0,0
0,0
0,0
3,1
0,0
6,3
0,0
0,0
0,0
0,0
0,0
0,0
0,0
0,0
6,7
0,0
6,7
77