AT90CAN32 Automotive Atmel Corporation, AT90CAN32 Automotive Datasheet - Page 242

• 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

19.4.4
19.4.5
19.5
19.5.1
242
Message Objects
AT90CAN32/64/128
Fault Confinement
Overload Frame
Operating Modes
Notes:
(c.f.
An overload frame is sent by setting an overload request (OVRQ). After the next reception, the
CAN channel sends an overload frame in accordance with the CAN specification. A status or
flag is set (OVRF) as long as the overload frame is sent.
Figure 19-9. Overload Frame
The MOb is a CAN frame descriptor. It contains all information to handle a CAN frame. This
means that a MOb has been outlined to allow to describe a CAN message like an object. The set
of MObs is the front end part of the “mailbox” where the messages to send and/or to receive are
pre-defined as well as possible to decrease the work load of the software.
The MObs are numbered from 0 up to 14 (no MOb [15]). They are independent but priority is
given to the lower one in case of multi matching. The operating modes are:
Every MOb has its own fields to control the operating mode. There is no default mode after
RESET. Before enabling the CAN peripheral, each MOb must be configured (ex: disabled mode
- CONMOB=00).
Table 19-1.
5. Tsjw = (1 to 4) x Tscl = (SJW[1..0]+ 1) x Tscl
MOb Configuration
Section 19.7 ”Error Management” on page
0
0
– Disabled mode
– Transmit mode
– Receive mode
– Automatic reply
– Frame buffer receive mode
1. The total number of Tscl (Time Quanta) in a bit time must be between 8 to 25.
2. PHS2[2..0] 2 is programmable to be
Instructions
OVRQ bit
OVFG bit
RXCDAN
TXCDAN
MOb Configuration
0
1
Reply Valid
x
x
x
Ident "A" Cmd
Setting OVRQ bit
RTR Tag
Message Data "A"
0
1
x
≤
PHS1[2..0] and
246).
Disabled
Tx Data Frame
Tx Remote Frame
Operating Mode
CRC
A
Interframe
≥
Resetting OVRQ bit
1.
Overload
Overload
Frame
Frame
7682C–AUTO–04/08
Ident "B"