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ATSAM4S-XPLD
715
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
Configure the TXD pin as PIO and set it as an output to 0 (to avoid LED emission). Disable the internal pull-up
(better for power consumption).
(better for power consumption).
Receive data
35.7.5.1 IrDA Modulation
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
pulse of 3/16th of a bit time. Some examples of signal pulse duration are shown in
Figure 35-34.IrDA Modulation
35.7.5.2 IrDA Baud Rate
gives some examples of CD values, baud rate error and pulse duration. Note that the requirement on the
maximum acceptable error of
±
1.87% must be met.
Table 35-12. IrDA Pulse Duration
Baud Rate
Pulse Duration (3/16)
2.4 Kb/s
78.13
μs
9.6 Kb/s
19.53
μs
19.2 Kb/s
9.77
μs
38.4 Kb/s
4.88
μs
57.6 Kb/s
3.26
μs
115.2 Kb/s
1.63
μs
Bit Period
Bit Period
3
16
Start
Bit
Data Bits
Stop
Bit
0
0
0
0
0
1
1
1
1
1
Transmitter
Output
TXD
Table 35-13. IrDA Baud Rate Error
Peripheral Clock
Baud Rate
CD
Baud Rate Error
Pulse Time
3 686 400
115 200
2
0.00%
1.63
20 000 000
115 200
11
1.38%
1.63
32 768 000
115 200
18
1.25%
1.63
40 000 000
115 200
22
1.38%
1.63
3 686 400
57 600
4
0.00%
3.26
20 000 000
57 600
22
1.38%
3.26
32 768 000
57 600
36
1.25%
3.26
40 000 000
57 600
43
0.93%
3.26
3 686 400
38 400
6
0.00%
4.88