AT90CAN64 Automotive Atmel Corporation, AT90CAN64 Automotive Datasheet - Page 246
AT90CAN64 Automotive
Manufacturer Part Number
AT90CAN64 Automotive
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT90CAN128_AUTOMOTIVE.pdf
(431 pages)
2.AT90CAN128_AUTOMOTIVE.pdf
(16 pages)
3.AT90CAN128_AUTOMOTIVE.pdf
(225 pages)
Specifications of AT90CAN64 Automotive
Flash (kbytes)
64 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
53
Ext Interrupts
8
Usb Speed
No
Usb Interface
No
Spi
1
Twi (i2c)
1
Uart
2
Can
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
8
Input Capture Channels
2
Pwm Channels
7
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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19.6
19.6.1
19.6.2
19.6.3
19.6.4
19.7
19.7.1
246
CAN Timer
Error Management
AT90CAN32/64/128
Prescaler
16-bit Timer
Time Triggering
Stamping Message
Fault Confinement
A programmable 16-bit timer is used for message stamping and time trigger communication
(TTC).
Figure 19-11. CAN Timer Block Diagram
An 8-bit prescaler is initialized by CANTCON register. It receives the clk
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).
The CAN channel may be in one of the three following states:
clk
CANTIM
– synchronization on Start of Frame (SYNCTTC=0),
– synchronization on End of Frame (SYNCTTC=1).
RXOK[i]
TXOK[i]
clk
IO
=
T
OVRTIM
clk
CANTIM
IO
x 8 x (CANTCON [7:0] + 1)
8
frequency to the CAN Timer if the CAN controller is enabled.
CANSTM[i]
overrun
CANTCON
CANTIM
clk
CANTIM
ENFG
CANTTC
IO
TTC
frequency divided by
SYNCTTC
7682C–AUTO–04/08
"EOF "
"SOF "
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