AT32UC3B1256 Atmel Corporation, AT32UC3B1256 Datasheet - Page 305

• Manufacturer Part Number: AT32UC3B1256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3B1256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 60 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 32
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 28
• Ext Interrupts: 28
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 6
• Adc Resolution (bits): 10
• Adc Speed (ksps): 384
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Operating Voltage (vcc): 3.0-3.6 or (1.65-1.95+3.0-3.6)
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 10
• Output Compare Channels: 16
• Input Capture Channels: 6
• Pwm Channels: 13
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

21.6.4.2
32059L–AVR32–01/2012
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
Figure 21-6. Transmitter Status
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 21-7. 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.
Baud Rate
TXEMPTY
TXRDY
Clock
Write
TXD
THR
Manchester
encoded
encoded
NRZ
data
data
Start
Bit
Txd
D0
D1
D2
1
D3
D4
0
D5
D6
1
D7
Figure 21-7
Parity
Bit
1
Stop
Bit
Start
Bit
0
D0
illustrates this coding scheme.
D1
0
D2
D3
0
D4
D5
1
D6
D7
Parity
Bit
Figure 21-8
Stop
Bit
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