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ATmega1284P bảng dữ liệu(PDF) 194 Page - ATMEL Corporation

tên linh kiện ATmega1284P
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
PDF  380 Pages
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ATmega1284P bảng dữ liệu(HTML) 194 Page - ATMEL Corporation

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194
8059D–AVR–11/09
ATmega1284P
17.12 Examples of Baud Rate Setting
For standard crystal and resonator frequencies, the most commonly used baud rates for asyn-
chronous operation can be generated by using the UBRR settings in Table 17-9 to Table 17-12.
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 186). The error values are calculated using the following equation:
Error[%]
BaudRate
Closest Match
BaudRate
--------------------------------------------------------
1
–
⎝⎠
⎛⎞
100%
•
=
Table 17-9.
Examples of UBRRn Settings for Commonly Used Oscillator Frequencies
Baud
Rate
(bps)
f
osc = 1.0000 MHz
f
osc = 1.8432 MHz
f
osc = 2.0000 MHz
U2Xn = 0U2Xn = 1
U2Xn = 0U2Xn = 1U2Xn = 0U2Xn = 1
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
UBRR
Error
2400
250.2%510.2%47
0.0%
950.0%510.2%
103
0.2%
4800
120.2%250.2%23
0.0%
470.0%250.2%510.2%
9600
6
-7.0%
12
0.2%
11
0.0%
23
0.0%
12
0.2%
25
0.2%
14.4k
3
8.5%
8
-3.5%
7
0.0%
15
0.0%
8
-3.5%
16
2.1%
19.2k
2
8.5%
6
-7.0%
5
0.0%
11
0.0%
6
-7.0%
12
0.2%
28.8k
1
8.5%
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
0
8.5%
1
8.5%
1
0.0%
3
0.0%
1
8.5%
3
8.5%
76.8k
–
–
1
-18.6%
1
-25.0%
2
0.0%
1
-18.6%
2
8.5%
115.2k
–
–
0
8.5%
0
0.0%
1
0.0%
0
8.5%
1
8.5%
230.4k
–
–
–––
–0
0.0%
–––
–
250k
–
–
–––
–––
––0
0.0%
Max. (1)
62.5 kbps
125 kbps
115.2 kbps
230.4 kbps
125 kbps
250 kbps
1.
UBRR = 0, Error = 0.0%



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