SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 806

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

35.7.5.1
35.7.5.2
806
806
SAM3X/A
SAM3X/A
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 35-12. IrDA Pulse Duration
Figure 35-34
Figure 35-34. IrDA Modulation
Table 35-13
the requirement on the maximum acceptable error of ±1.87% must be met.
Table 35-13. IrDA Baud Rate Error
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
• Configure the TXD pin as PIO and set it as an output to 0 (to avoid LED emission). Disable
• Receive data
the internal pull-up (better for power consumption).
Table
gives some examples of CD values, baud rate error and pulse duration. Note that
shows an example of character transmission.
Transmitter
35-12.
Output
TXD
Baud Rate
115 200
115 200
115 200
115 200
57 600
57 600
57 600
Bit Period
Start
Bit
0
1
0
78.13 μs
19.53 μs
Pulse Duration (3/16)
9.77 μs
4.88 μs
3.26 μs
1.63 μs
CD
11
18
22
22
36
1
2
4
Data Bits
0
0
Baud Rate Error
1
0.00%
1.38%
1.25%
1.38%
0.00%
1.38%
1.25%
1
16
3
0
Bit Period
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Stop
Bit
1
Pulse Time
1.63
1.63
1.63
1.63
3.26
3.26
3.26