AT32UC3L0256 Atmel Corporation, AT32UC3L0256 Datasheet - Page 777

• Manufacturer Part Number: AT32UC3L0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3L0256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 50 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 17
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Speed: No
• Usb Interface: No
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 460
• Analog Comparators: 8
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.62 to 3.6
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 35
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Table 31-31. aWire Packet Format
32145A–12/2011
Field
LENGTH
DATA
CRC
Number of bytes
2
LENGTH
2
CRC calculation
The CRC is calculated from the command/response, length, and data fields. The polynomial
used is the FCS16 (or CRC-16-CCIT) in reverse mode (0x8408) and the starting value is
0x0000.
Example command
Below is an example command from the master with additional data.
Figure 31-9. Example Command
Example response
Below is an example response from the slave with additional data.
Figure 31-10. Example Response
baud_rate_clk
data_pin
field
...
baud_rate_clk
data_pin
field
...
Description
The number of bytes in the DATA
field.
Data according to command/
response.
CRC calculated with the FCS16
polynomial.
sync(0x55)
data(MSB)
sync(0x55)
data(MSB)
command(0x81)
data(LSB)
response(0xC1)
data(LSB)
Comment
CRC value of 0x0000 makes the aWire
disregard the CRC if the master does not
support it.
length(MSB)
CRC(MSB)
length(MSB)
CRC(MSB)
AT32UC3L0128/256
length(lsb)
CRC(lsb)
length(lsb)
CRC(lsb)
Optional
Yes
Yes
No
...
...
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