
253
7682C–AUTO–04/08
AT90CAN32/64/128
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.
19.10.3
CAN General Interrupt Register - CANGIT
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.
Bit 4 – BXOK: Frame Buffer Receive Interrupt
Writing a logical one resets this interrupt flag. BXOK flag can be cleared only if all CONMOB
fields of the MOb’s of the buffer have been re-written before.
– 0 - no interrupt.
– 1 - burst receive interrupt: set when the frame buffer receive is completed.
Bit 3 – SERG: Stuff Error General
Writing a logical one resets this interrupt flag.
– 0 - no interrupt.
Bit
7
6
5
4
3
2
1
0
CANIT
BOFFIT
OVRTIM
BXOK
SERG
CERG
FERG
AERG
CANGIT
Read/Write
R
R/W
Initial Value
0