AT32UC3A4256 Atmel Corporation, AT32UC3A4256 Datasheet - Page 567

• Manufacturer Part Number: AT32UC3A4256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A4256

• Flash (kbytes): 256 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 66 MHz
• Cpu: 32-bit AVR
• Hardware Qtouch Acquisition: No
• Usb Transceiver: 1
• Usb Speed: Hi-Speed
• Usb Interface: Device + OTG
• Spi: 6
• Twi (i2c): 2
• Uart: 4
• Ssc: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0 to 3.6
• Operating Voltage (vcc): 3.0 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.6.5
25.6.5.1
32072G–11/2011
IrDA Mode
IrDA Modulation
The USART features an IrDA mode, supporting asynchronous, half-duplex, point-to-point wire-
less communication. It embeds the modulator and demodulator, allowing for a glueless
connection to the infrared transceivers, as shown in
enables this mode, and activates the IrDA specification v1.1 compliant modem. Data transfer
speeds ranging from 2.4Kbit/s to 115.2Kbit/s are supported and the character format is fixed to
one start bit, eight data bits, and one stop bit.
Figure 25-32. Connection to IrDA Transceivers
The receiver and the transmitter must be exclusively enabled or disabled, according to the direc-
tion of the transmission. To receive IrDA signals, the following needs to be done:
The RZI modulation scheme is used, where a zero is represented by a light pulse one 3/16
a bit period, and no pulse to represent a one. Some examples of signal pulse duration are
shown in
Table 25-10. IrDA Pulse Duration
Figure 25-33
Baud Rate
2.4 Kbit/s
9.6 Kbit/s
19.2 Kbit/s
38.4 Kbit/s
57.6 Kbit/s
115.2 Kbit/s
• Disable TX and enable RX.
• Configure the TXD pin as an I/O, outputting zero to avoid LED activation. Disable the internal
• Receive data.
pull-up for improved power consumption.
Table
shows an example of character transmission.
Transmitter
25-10.
Receiver
USART
Demodulator
Modulator
Pulse Duration (3/16)
78.13 µs
19.53 µs
9.77 µs
4.88 µs
3.26 µs
1.63 µs
RXD
TXD
Figure
25-32. Writing 0x8 to MR.MODE
RX
TX
Transceivers
IrDA
th
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