AT32UC3B1128 Atmel Corporation, AT32UC3B1128 Datasheet - Page 308

• Manufacturer Part Number: AT32UC3B1128
• Manufacturer: Atmel Corporation

Specifications of AT32UC3B1128

• Flash (kbytes): 128 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

21.6.4.4
32059L–AVR32–01/2012
Manchester Decoder
nization mechanism will only consider one stop bit, regardless of the used protocol, and when
the first stop bit has been sampled, the receiver will automatically begin looking for a new start
bit, enabling resynchronization even if there is a protocol miss-match.
21-12
Figure 21-11. Asynchronous Start Bit Detection
Figure 21-12. Asynchronous Character Reception
When MR.MAN is one, the Manchester endec is enabled. The decoder can detect selectable
preamble sequences and start frame delimiters. The Receiver Manchester Polarity bit
(MAN.RX_MPOL) selects input stream polarity. The Receiver Preamble Length field
(MAN.RX_PL) specifies the length characteristics of detectable preambles, and if written to zero
the preamble pattern detection will be disabled. The Receiver Preamble Pattern field
(MAN.RX_PP) selects the pattern to be detected. See
terns.
The Manchester endec uses the same Start Frame Delimiter Selector (MR.ONEBIT) for both
encoder and decoder. If ONEBIT is one, only a Manchester encoded zero will be accepted as a
valid start frame delimiter. If ONEBIT is zero, a data or command sync pattern will be expected.
The Received Sync bit in the Receive Holding Register (RHR.RXSYNH) will be zero if it is a data
sync, and a one if it is a command sync.
Clock (x16)
Baud Rate
Sampling
Sampling
Sampling
Baud Rate
Example: 8-bit, Parity Enabled
Detection
illustrate start bit detection and character reception in asynchronous mode.
Clock
Figure 21-13
RXD
RXD
Start
Clock
RXD
1
1
2
2
illustrates two types of Manchester preamble pattern mismatches.
samples
3
3
16
4
4
D0
5
5
samples
16
6
6
D1
7
Detection
7
Rejection
samples
Start
Start
16
8
0
D2
1
1
samples
16
2
2
3
3
D3
samples
4
4
16
5
D4
samples
Figure 21-8
6
16
7
D5
samples
8
16
9 10 11 12 13 14 15 16
D6
samples
for available preamble pat-
16
Figure 21-11
D7
samples
16
Parity
Bit
samples
16
and
Stop
Bit
Sampling
Figure
D0
308