AT32UC3A464S Atmel Corporation, AT32UC3A464S Datasheet - Page 554

• Manufacturer Part Number: AT32UC3A464S
• Manufacturer: Atmel Corporation

Specifications of AT32UC3A464S

• 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: AES
• 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

25.6.3.2
32072G–11/2011
Manchester Encoder
Manchester II Biphase format. To enable this mode, write a one to MR.MAN. Depending on
polarity configuration, as selected by the Transmission Manchester Polarity bit in the Man-
the transition from high -to-low or low-to-high during the middle of each bit period. This consumes
When the Manchester endec is used, characters transmitted through the USART are encoded in
chester Configuration Register (MAN.TX_MOPL), a logic level (zero or one), is transmitted as
twice the bandwidth than the simpler NRZ coding schemes, but the receiver has more error con-
trol since the expected input has a transition at every mid-bit period. An example of a
Manchester encoded sequence is the byte 0xB1 or 10110001 being encoded to 10 01 10 10 01
01 01 10, assuming default encoder polarity.
Figure 25-7. NRZ to Manchester Encoding
A Manchester encoded character can be preceded by both a preamble sequence, and a start
frame delimiter. The preamble sequence is a pre-defined pattern with a configurable length from
1 to 15 bit periods. If the preamble length is zero, the preamble waveform is not generated. The
length is selected by writing to the Transmitter Preamble Length field (MAN.TX_PL). The avail-
able preamble sequence patterns are: ALL_ONE, ALL_ZERO, ONE_ZERO or ZERO_ONE, and
are selected by writing to the Transmitter Preamble Pattern field (MAN.TX_PP).
illustrates the supported patterns.
Figure 25-8. Preamble Patterns, Default Polarity Assumed
Manchester
Manchester
Manchester
Manchester
encoded
encoded
encoded
encoded
data
data
data
data
Manchester
encoded
encoded
NRZ
data
data
Txd
Txd
Txd
Txd
Txd
8 bit width "ZERO_ONE" Preamble
8 bit width "ONE_ZERO" Preamble
8 bit width "ALL_ZERO" Preamble
1
8 bit width "ALL_ONE" Preamble
0
1
Figure 25-7
1
0
illustrates this coding scheme.
0
0
SFD
SFD
SFD
SFD
1
DATA
DATA
DATA
DATA
Figure 25-8
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