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AT90S8515-4AI Datasheet(PDF) 58 Page - ATMEL Corporation

Part # AT90S8515-4AI
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90S8515-4AI Datasheet(HTML) 58 Page - ATMEL Corporation

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58
AT90S8515
0841G–09/01
Table 17. UBRR Settings at Various Crystal Frequencies
UART BAUD Rate Register –
UBRR
The UBRR register is an 8-bit read/write register that specifies the UART Baud Rate
according to the equation on the previous page.
Baud Rate
1MHz %Error
1.8432 MHz %Error
2MHz %Error
2.4576 MHz %Error
2400 UBRR=
25
0.2 UBRR=
47
0.0 UBRR=
51
0.2 UBRR=
63
0.0
4800 UBRR=
12
0.2 UBRR=
23
0.0 UBRR=
25
0.2 UBRR=
31
0.0
9600 UBRR=
6
7.5 UBRR=
11
0.0 UBRR=
12
0.2 UBRR=
15
0.0
14400 UBRR=
3
7.8 UBRR=
70.0 UBRR=
8
3.7 UBRR=
10
3.1
19200 UBRR=
2
7.8 UBRR=
50.0 UBRR=
6
7.5 UBRR=
70.0
28800 UBRR=
1
7.8 UBRR=
30.0 UBRR=
3
7.8 UBRR=
4
6.3
38400 UBRR=
1
22.9 UBRR=
20.0 UBRR=
2
7.8 UBRR=
30.0
57600 UBRR=
0
7.8 UBRR=
10.0 UBRR=
1
7.8 UBRR=
2
12.5
76800 UBRR=
0
22.9 UBRR=
1
33.3 UBRR=
1
22.9 UBRR=
10.0
115200 UBRR=
0
84.3 UBRR=
00.0 UBRR=
0
7.8 UBRR=
0
25.0
Baud Rate 3.2768 MHz %Error
3.6864 MHz %Error
4MHz %Error
4.608 MHz %Error
2400 UBRR=
84
0.4 UBRR=
95
0.0 UBRR=
103
0.2 UBRR=
119
0.0
4800 UBRR=
42
0.8 UBRR=
47
0.0 UBRR=
51
0.2 UBRR=
59
0.0
9600 UBRR=
20
1.6 UBRR=
23
0.0 UBRR=
25
0.2 UBRR=
29
0.0
14400 UBRR=
13
1.6 UBRR=
15
0.0 UBRR=
16
2.1 UBRR=
19
0.0
19200 UBRR=
10
3.1 UBRR=
11
0.0 UBRR=
12
0.2 UBRR=
14
0.0
28800 UBRR=
61.6 UBRR=
70.0 UBRR=
8
3.7 UBRR=
90.0
38400 UBRR=
4
6.3 UBRR=
50.0 UBRR=
6
7.5 UBRR=
7
6.7
57600 UBRR=
3
12.5 UBRR=
30.0 UBRR=
3
7.8 UBRR=
40.0
76800 UBRR=
2
12.5 UBRR=
20.0 UBRR=
2
7.8 UBRR=
3
6.7
115200 UBRR=
1
12.5 UBRR=
10.0 UBRR=
1
7.8 UBRR=
2
20.0
Baud Rate 7.3728 MHz %Error
8MHz %Error
9.216 MHz %Error
11.059 MHz %Error
2400 UBRR=
191
0.0 UBRR=
207
0.2 UBRR=
239
0.0 UBRR=
287
-
4800 UBRR=
95
0.0 UBRR=
103
0.2 UBRR=
119
0.0 UBRR=
143
0.0
9600 UBRR=
47
0.0 UBRR=
51
0.2 UBRR=
59
0.0 UBRR=
71
0.0
14400 UBRR=
31
0.0 UBRR=
34
0.8 UBRR=
39
0.0 UBRR=
47
0.0
19200 UBRR=
23
0.0 UBRR=
25
0.2 UBRR=
29
0.0 UBRR=
35
0.0
28800 UBRR=
15
0.0 UBRR=
16
2.1 UBRR=
19
0.0 UBRR=
23
0.0
38400 UBRR=
11
0.0 UBRR=
12
0.2 UBRR=
14
0.0 UBRR=
17
0.0
57600 UBRR=
70.0 UBRR=
8
3.7 UBRR=
90.0 UBRR=
11
0.0
76800 UBRR=
50.0 UBRR=
6
7.5 UBRR=
7
6.7 UBRR=
80.0
115200 UBRR=
30.0 UBRR=
3
7.8 UBRR=
40.0 UBRR=
50.0
Bit
765
432
10
$09 ($29)
MSB
LSB
UBRR
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0


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