AT90CAN32 Automotive Atmel Corporation, AT90CAN32 Automotive Datasheet - Page 265

• Manufacturer Part Number: AT90CAN32 Automotive
• Manufacturer: Atmel Corporation

Specifications of AT90CAN32 Automotive

• Flash (kbytes): 32 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): 2
• Eeprom (bytes): 1024
• 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

19.11.6
19.12 Examples of CAN Baud Rate Setting
Table 19-2.
7682C–AUTO–04/08
f
(MHz)
16.000
clk
io
CAN Data Message Register - CANMSG
CAN
Baud
Rate
(Kbps)
1000
500
250
200
125
100
Examples of CAN Baud Rate Settings for Commonly Frequencies
Sampling
69 %
Point
75 %
75 %
75 %
75 %
75 %
75 %
• Bit 7:0 – MSG7:0: Message Data
This register contains the CAN data byte pointed at the page MOb register.
After writing in the page MOb register, this byte is equal to the specified message location of the
pre-defined identifier + index. If auto-incrementation is used, at the end of the data register writ-
ing or reading cycle, the index is auto-incremented.
The range of the counting is 8 with no end of loop (0, 1,..., 7, 0,...).
The CAN bus requires very accurate timing especially for high baud rates. It is recommended to
use only an external crystal for CAN operations.
(Refer to
256
(1)
Initial Value
Read/Write
to
Description
Bit
page 257
0.0625
0.3125
“Bit Timing” on page 240
0.125
0.125
0.250
0.250
0.500
0.625
0.500
1.000
0.625
1.250
(µs)
TQ
MSG 7
R/W
7
-
for “CAN Bit Timing Registers”).
(TQ)
Tbit
16
16
16
16
16
16
8
8
8
8
8
8
MSG 6
R/W
6
-
Tprs
(TQ)
MSG 5
7
3
7
3
7
3
7
3
7
3
7
3
R/W
5
-
and
Tph1
(TQ)
MSG 4
“Baud Rate” on page 241
4
2
4
2
4
2
4
2
4
2
4
2
R/W
Segments
4
-
Tph2
MSG 3
(TQ)
R/W
4
2
4
2
4
2
4
2
4
2
4
2
3
-
MSG 2
R/W
Tsjw
(TQ)
2
-
1
1
1
1
1
1
1
1
1
1
1
1
AT90CAN32/64/128
MSG 1
CANBT1
R/W
for timing description and
1
-
0x0E
0x0E
0x1E
0x00
0x02
0x02
0x06
0x06
0x08
0x12
0x12
0x26
MSG 0
R/W
0
-
Registers
CANBT2
0x0C
0x0C
0x0C
0x0C
0x0C
0x0C
0x04
0x04
0x04
0x04
0x04
0x04
CANMSG
CANBT3
0x37
0x13
0x37
0x13
0x37
0x13
0x37
0x13
0x37
0x13
0x37
0x13
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