ATmega16M1 Automotive Atmel Corporation, ATmega16M1 Automotive Datasheet - Page 182

• Manufacturer Part Number: ATmega16M1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega16M1 Automotive

• Flash (kbytes): 16 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): 1
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• 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

16.6
16.6.1
16.6.2
16.6.3
16.6.4
182
CAN Timer
Atmel ATmega16/32/64/M1/C1
Prescaler
16-bit Timer
Time Triggering
Stamping Message
A programmable 16-bit timer is used for message stamping and time trigger communication
(TTC).
Figure 16-11. CAN Timer Block Diagram
An 8-bit prescaler is initialized by CANTCON register. It receives the clk
by 8. It provides clk
T
This timer starts counting from 0x0000 when the CAN controller is enabled (ENFG bit). When
the timer rolls over from 0xFFFF to 0x0000, an interrupt is generated (OVRTIM).
Two synchronization modes are implemented for TTC (TTC bit):
In TTC mode, a frame is sent once, even if an error occurs.
The capture of the timer value is done in the MOb which receives or sends the frame. All man-
aged MOb are stamped, the stamping of a received (sent) frame occurs on RxOk (TXOK).
clk
RXOK[i]
TXOK[i]
CANTIM
clk
– synchronization on Start of Frame (SYNCTTC=0),
– synchronization on End of Frame (SYNCTTC=1).
IO
=
OVRTIM
T
clk
IO
8
CANTIM
x 8 x (CANTCON [7:0] + 1)
CANSTM[i]
overrun
frequency to the CAN Timer if the CAN controller is enabled.
CANTCON
CANTIM
clk
CANTIM
ENFG
CANTTC
TTC
IO
frequency divided
SYNCTTC
7647G–AVR–09/11
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