AT91RM3400-DK Atmel, AT91RM3400-DK Datasheet - Page 289
AT91RM3400-DK
Manufacturer Part Number
AT91RM3400-DK
Description
KIT DEV FOR AT91RM3400
Manufacturer
Atmel
Series
AT91SAM Smart ARMr
Type
MCUr
Datasheets
1.AT91RM3400-DK.pdf
(461 pages)
2.AT91RM3400-DK.pdf
(2 pages)
3.AT91RM3400-DK.pdf
(25 pages)
Specifications of AT91RM3400-DK
Contents
Evaluation Board, Software and Documentation
Processor To Be Evaluated
AT91RM3400
Data Bus Width
32 bit
Interface Type
RS-232, USB
For Use With/related Products
AT91RM3400
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 289 of 461
- Download datasheet (6Mb)
IrDA Demodulator
Figure 113. IrDA Demodulator Operations
1790A–ATARM–11/03
Receiver
Counter
Value
Input
MCK
RXD
6
5
4
Rejected
Pulse
Table 52. IrDA Baud Rate Error
The demodulator is based on the IrDA Receive filter comprised of an 8-bit down counter which
is loaded with the value programmed in US_IF. When a falling edge is detected on the RXD
pin, the Filter Counter starts counting down at the Master Clock (MCK) speed. If a rising edge
is detected on the RXD pin, the counter stops and is reloaded with US_IF. If no rising edge is
detected when the counter reaches 0, the input of the receiver is driven low during one bit
time.
Figure 113 illustrates the operations of the IrDA demodulator.
As the IrDA mode uses the same logic as the ISO7816, note that the FI_DI_RATIO field in
US_FIDI must be set to a value higher than 0 in order to assure IrDA communications operate
correctly.
3
Peripheral Clock
40 000 000
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
32 768 000
2
6
6
5
Baud rate
38 400
19 200
19 200
19 200
19 200
9 600
9 600
9 600
9 600
2 400
2 400
2 400
4
3
2
1
0
CD
65
12
65
107
130
24
130
213
260
96
521
853
Accepted
Pulse
Driven Low During 16 Baud Rate Clock Cycles
Baud rate Error
0.16%
0.00%
0.16%
0.31%
0.16%
0.00%
0.16%
0.16%
0.16%
0.00%
0.03%
0.04%
AT91RM3400
Pulse time
4.88
9.77
9.77
9.77
9.77
19.53
19.53
19.53
19.53
78.13
78.13
78.13
289
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