ATmega32M1 Atmel Corporation, ATmega32M1 Datasheet - Page 199

• Manufacturer Part Number: ATmega32M1
• Manufacturer: Atmel Corporation

Specifications of ATmega32M1

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 14
• Input Capture Channels: 1
• Pwm Channels: 10
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

20.3
20.3.1
20.3.2
Figure 20-3. Structure of a LIN frame
8209D–AVR–11/10
LIN Protocol
Master and Slave
Frames
BREAK
Break Delimiter
Field
A LIN cluster consists of one master task and several slave tasks. A master node contains the
master task as well as a slave task. All other nodes contain a slave task only.
Figure 20-1. LIN cluster with one master node and “n” slave nodes
The master task decides when and which frame shall be transferred on the bus. The slave tasks
provide the data transported by each frame. Both the master task and the slave task are parts of
the Frame handler.
A frame consists of a header (provided by the master task) and a response (provided by a slave
task).
The header consists of a BREAK and SYNC pattern followed by a PROTECTED IDENTIFIER.
The identifier uniquely defines the purpose of the frame. The slave task appointed for providing
the response associated with the identifier transmits it. The response consists of a DATA field
and a CHECKSUM field.
Figure 20-2. Master and slave tasks behavior in LIN frame
The slave tasks waiting for the data associated with the identifier receives the response and
uses the data transported after verifying the checksum.
HEADER
Slave Task 1
Slave Task 2
Master Task
SYNC
Field
master node
master task
slave task
PROTECTED
IDENTIFIER
HEADER
Response Space
Field
FRAME SLOT
RESPONSE
DATA-0
slave node
slave task
LIN bus
Field
1
ATmega16M1/32M1/64M1
RESPONSE
Each byte field is transmitted as a serial byte, LSB first.
DATA-n
HEADER
Inter-Byte Space
Field
slave node
slave task
CHECKSUM
n
RESPONSE
Field
Inter-Frame Space
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