at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 449
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at91sam9260-cj
Manufacturer Part Number
at91sam9260-cj
Description
At91 Arm Thumb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet
1.AT91SAM9260-CJ.pdf
(790 pages)
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32.6.5.1
Figure 32-24. IrDA Modulation
32.6.5.2
6221G–ATARM–31-Jan-08
IrDA Modulation
IrDA Baud Rate
For baud rates up to and including 115.2 Kbits/sec, the RZI modulation scheme is used. “0” is
represented by a light pulse of 3/16th of a bit time. Some examples of signal pulse duration are
shown in
Table 32-9.
Figure 32-24
Table 32-10
the requirement on the maximum acceptable error of ±1.87% must be met.
Table 32-10. IrDA Baud Rate Error
Transmitter
Baud Rate
2.4 Kb/s
9.6 Kb/s
19.2 Kb/s
38.4 Kb/s
57.6 Kb/s
115.2 Kb/s
Peripheral Clock
3 686 400
20 000 000
32 768 000
40 000 000
3 686 400
20 000 000
32 768 000
40 000 000
3 686 400
20 000 000
Output
TXD
Table
gives some examples of CD values, baud rate error and pulse duration. Note that
shows an example of character transmission.
Bit Period
IrDA Pulse Duration
Start
32-9.
Bit
0
1
Baud Rate
115 200
115 200
115 200
115 200
57 600
57 600
57 600
57 600
38 400
38 400
0
1
Data Bits
0
0
Pulse Duration (3/16)
78.13 µs
19.53 µs
9.77 µs
4.88 µs
3.26 µs
1.63 µs
CD
11
18
22
22
36
43
33
2
4
6
1
1
16
3
Baud Rate Error
0
Bit Period
Stop
0.00%
1.38%
1.25%
1.38%
0.00%
1.38%
1.25%
0.93%
0.00%
1.38%
Bit
1
AT91SAM9260
Pulse Time
1.63
1.63
1.63
1.63
3.26
3.26
3.26
3.26
4.88
4.88
449
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