ATmega16/32/64/M1/C1
• Bit 2 – ENFG: Enable Flag
This flag does not generate an interrupt.
– 0 - CAN controller disable: because an enable/standby command is not immediately
effective, this status gives the true state of the chosen mode.
– 1 - CAN controller enable.
• Bit 1 – BOFF: Bus Off Mode
BOFF gives the information of the state of the CAN channel. Only entering in bus off mode gen-
erates the BOFFIT interrupt.
– 0 - no bus off mode.
– 1 - bus off mode.
• Bit 0 – ERRP: Error Passive Mode
ERRP gives the information of the state of the CAN channel. This flag does not generate an
interrupt.
– 0 - no error passive mode.
– 1 - error passive mode.
16.10.3 CAN General Interrupt Register - CANGIT
Bit
7
6
5
OVRTIM
R/W
0
4
BXOK
R/W
0
3
SERG
R/W
0
2
CERG
R/W
0
1
FERG
R/W
0
0
AERG
R/W
0
CANIT
BOFFIT
R/W
0
CANGIT
Read/Write
Initial Value
R
0
• Bit 7 – CANIT: General Interrupt Flag
This is a read only bit.
– 0 - no interrupt.
– 1 - CAN interrupt: image of all the CAN controller interrupts except for OVRTIM
interrupt. This bit can be used for polling method.
• Bit 6 – BOFFIT: Bus Off Interrupt Flag
Writing a logical one resets this interrupt flag. BOFFIT flag is only set when the CAN enters in
bus off mode (coming from error passive mode).
– 0 - no interrupt.
– 1 - bus off interrupt when the CAN enters in bus off mode.
• Bit 5 – OVRTIM: Overrun CAN Timer
Writing a logical one resets this interrupt flag. Entering in CAN timer overrun interrupt handler
also reset this interrupt flag
– 0 - no interrupt.
– 1 - CAN timer overrun interrupt: set when the CAN timer switches from 0xFFFF to 0.
189
7647F–AVR–04/09
ATMEL [ ATMEL ]
