AT90CAN64 Atmel Corporation, AT90CAN64 Datasheet - Page 266

• Manufacturer Part Number: AT90CAN64
• Manufacturer: Atmel Corporation

Specifications of AT90CAN64

• 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 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: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

19.11.5
19.11.6
19.12 Examples of CAN Baud Rate Setting
266
AT90CAN32/64/128
CAN Time Stamp Registers - CANSTML and CANSTMH
CAN Data Message Register - CANMSG
• Bit 31:3 – IDMSK28:0: Identifier Mask
• Bit 2 – RTRMSK: Remote Transmission Request Mask
• Bit 1 – Reserved Bit
Writing zero in this bit is recommended.
• Bit 0 – IDEMSK: Identifier Extension Mask
• Bits 15:0 - TIMSTM15:0: Time Stamp Count
CAN time stamp counter range 0 to 65,535.
• 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
257
Initial Value
Read/Write
Initial Value
Read/Write
to
Bit
Bit
Bit
– 0 - comparison true forced -
– 1 - bit comparison enabled -
– 0 - comparison true forced
– 1 - bit comparison enabled.
– 0 - comparison true forced
– 1 - bit comparison enabled.
page 258
“Bit Timing” on page 241
TIMSTM15 TIMSTM14 TIMSTM13 TIMSTM12 TIMSTM11 TIMSTM10 TIMSTM9 TIMSTM8 CANSTMH
TIMSTM7 TIMSTM6 TIMSTM5 TIMSTM4 TIMSTM3 TIMSTM2 TIMSTM1 TIMSTM0
MSG 7
15
R/W
R
7
-
7
-
for “CAN Bit Timing Registers”).
MSG 6
14
R/W
R
6
-
6
-
MSG 5
13
R/W
R
5
-
5
-
and
See “Acceptance Filter” on page 246.
See “Acceptance Filter” on page 246.
MSG 4
“Baud Rate” on page 242
R/W
12
R
4
-
4
-
MSG 3
R/W
11
R
3
-
3
-
MSG 2
R/W
10
R
2
-
2
-
MSG 1
R/W
R
for timing description and
1
9
1
-
-
MSG 0
R/W
R
0
8
0
-
-
CANSTML
CANMSG
7679H–CAN–08/08
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