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AT90PWM2 bảng dữ liệu(PDF) 217 Page - ATMEL Corporation

tên linh kiện AT90PWM2
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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217
AT90PWM2/3
4317B–AVR–02/05
Examples of Baud Rate
Setting
For standard crystal, resonator and external oscillator frequencies, the most commonly
used baud rates for asynchronous operation can be generated by using the UBRR set-
tings in Table 83 up to Table 86. UBRR values which yield an actual baud rate differing
less than 0.5% from the target baud rate, are bold in the table. Higher error ratings are
acceptable, but the Receiver will have less noise resistance when the error ratings are
high, especially for large serial frames (see “Asynchronous Operational Range” on page
208). The error values are calculated using the following equation:
Error[%]
1
BaudRate
Closest Match
BaudRate
--------------------------------------------------------
–
⎝⎠
⎛⎞
100%
•
=
Table 83. Examples of UBRR Settings for Commonly Frequencies
Baud
Rate
(bps)
fclk
io = 1.0000 MHz
fclk
io = 1.8432 MHz
fclk
io = 2.0000 MHz
U2X = 0
U2X = 1
U2X = 0
U2X = 1
U2X = 0
U2X = 1
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
2400
25
0.2%
51
0.2%
47
0.0%
95
0.0%
51
0.2%
103
0.2%
4800
12
0.2%
25
0.2%
23
0.0%
47
0.0%
25
0.2%
51
0.2%
9600
6-7.0%
12
0.2%
11
0.0%
23
0.0%
12
0.2%
25
0.2%
14.4k
38.5%8
-3.5%
70.0%
15
0.0%
8
-3.5%
16
2.1%
19.2k
28.5%6
-7.0%
50.0%
11
0.0%
6-7.0%
12
0.2%
28.8k
18.5%3
8.5%
3
0.0%
7
0.0%
3
8.5%
8
-3.5%
38.4k
1
-18.6%
2
8.5%
2
0.0%
5
0.0%
2
8.5%
6
-7.0%
57.6k
08.5%1
8.5%
1
0.0%
3
0.0%
18.5%
3
8.5%
76.8k
–
–
1
-18.6%
1
-25.0%
20.0%
1
-18.6%
2
8.5%
115.2k
–
–
08.5%
0
0.0%
1
0.0%
08.5%
1
8.5%
230.4k
–
–––––0
0.0%
––––
250k
–
––––––
–––––
500k
–
––––––
–––––
1M
–
––––––
–––––
Max.
(1)
62.5 kbps
125 kbps
115.2 kbps
230.4 Kbps
125 kpbs
250 kbps
1.
UBRR = 0, Error = 0.0%



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