AT32UC3A464 Atmel Corporation, AT32UC3A464 Datasheet - Page 558

• Manufacturer Part Number: AT32UC3A464
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A464

• Flash (kbytes): 64 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
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25.6.3.5
Figure 25-16. Manchester Encoded Characters RF Transmission
32072G–11/2011
Radio Interface: Manchester Endec Application
Downstream
Upstream
Emitter
Receiver
If a valid preamble pattern or start frame delimiter is detected, the receiver continues decoding
with the same synchronization. If the stream does not match a valid preamble pattern or a start
frame delimiter, the receiver re-synchronizes at the next valid edge. When a valid start sequence
has been detected, the decoded data is passed to the USART and the user will be notified of
any incoming Manchester encoding violations by the Manchester Error bit (CSR.MANE). This bit
is cleared by writing a one to the Reset Status bits in the Control Register (CR.RSTSTA). A vio-
lation occours when there is no transition in the middle of a bit period. See
illustration of a violation causing the Manchester Error bit to be set.
Figure 25-15. Manchester Error
This section describes low data rate, full duplex, dual frequency, RF systems integrated with a
Manchester endec, that support ASK and/or FSK modulation schemes. See
To transmit downstream, encoded data is sent serially to the RF modulator and then through
space to the RF receiver. To receive, another frequency carrier is used and the RF demodulator
Manchester
Fdown frequency Carrier
Fup frequency Carrier
encoded
data
sampling points
Txd
Preamble Length
is set to 4
and Start Frame Delimiter
downstream transmitter
Preamble subpacket
Upstream Receiver
were successfully
RF filter
control
RF filter
control
Demod
SFD
VCO
VCO
ASK/FSK
LNA
Mod
PA
ASK/FSK
decoded
Entering USART character area
bi-dir
Elementary character bit time
line
Configuration
Manchester
Manchester
decoder
encoder
Interface
Figure 25-15
Figure
Serial
Coding Error
Manchester
25-16.
detected
Receiver
USART
USART
Emitter
for an
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