AT91RM9200-QI-002 Atmel, AT91RM9200-QI-002 Datasheet - Page 432

• Manufacturer Part Number: AT91RM9200-QI-002
• Description: IC ARM9 MCU 208 PQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-QI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 208-MQFP, 208-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

30.6.5.1
30.6.5.2
432
AT91RM9200
IrDA Modulation
IrDA Baud Rate
The receiver and the transmitter must be enabled or disabled according to the direction of the
transmission to be managed.
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 30-9.
Figure 30-23
Figure 30-23. IrDA Modulation
Table 30-10
the requirement on the maximum acceptable error of +/- 1.87% must be met.
Table 30-10. 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
Table
gives some examples of CD values, baud rate error and pulse duration. Note that
shows an example of character transmission.
Transmitter
IrDA Pulse Duration
30-9.
Output
TXD
Baud rate
115 200
115 200
115 200
115 200
57 600
57 600
57 600
Pulse Duration
(3/16)
78.13 µs
19.53 µs
9.77 µs
4.88 µs
3.26 µs
1.63 µs
Bit Period
Start
Bit
0
1
CD
2
11
18
22
4
22
36
0
1
Data Bits
0
0
Baud rate Error
0.00%
1.38%
1.25%
1.38%
0.00%
1.38%
1.25%
1
1
16
3
0
Bit Period
Start
Bit
Pulse time
1.63
1.63
1.63
1.63
3.26
3.26
3.26
1
1768I–ATARM–09-Jul-09