Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Hoja De Datos
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ATSAM4L-XSTK
595
42023E–SAM–07/2013
ATSAM4L8/L4/L2
24.6.9.1
IrDA Modulation
The RZI modulation scheme is used, where a zero is represented by a light pulse 3/16 of a bit
period, and no pulse to represent a one. Some examples of signal pulse duration are shown in
period, and no pulse to represent a one. Some examples of signal pulse duration are shown in
.
shows an example of character transmission.
Figure 24-26. IrDA Modulation
24.6.9.2
IrDA Baud Rate
As the IrDA mode shares some logic with the ISO7816 mode, the FIDI.FI_DI_RATIO field must
be configured correctly.
be configured correctly.
shows some examples
of BRGR.CD values, baud rate error, and pulse duration. Note that the maximal acceptable error
rate of ±1.87% must be met.
rate of ±1.87% must be met.
Table 24-12. IrDA Pulse Duration
Baud Rate
Pulse Duration (3/16)
2.4 Kbit/s
78.13 µs
9.6 Kbit/s
19.53 µs
19.2 Kbit/s
9.77 µs
38.4 Kbit/s
4.88 µs
57.6 Kbit/s
3.26 µs
115.2 Kbit/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 24-13. 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