16.10.3 CAN General Interrupt Register - CANGIT
Bit
7
6
5
4
3
SERG
R/W
0
2
CERG
R/W
0
1
FERG
R/W
0
0
AERG
R/W
0
CANIT
BOFFIT OVRTIM BXOK
CANGIT
Read/Write
Initial Value
R
0
R/W
0
R/W
0
R/W
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.
• 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.
1 - stuff error interrupt: detection of more than 5 consecutive bits with the same polarity.
• Bit 2 – CERG: CRC Error General
Writing a logical one resets this interrupt flag.
●
●
0 - no interrupt.
1 - CRC error interrupt: the CRC check on destuffed message does not fit with the CRC field.
• Bit 1 – FERG: Form Error General
Writing a logical one resets this interrupt flag.
●
●
0 - no interrupt.
1 - form error interrupt: one or more violations of the fixed form in the CRC delimiter, acknowledgment delimiter or
EOF.
• Bit 0 – AERG: Acknowledgment Error General
Writing a logical one resets this interrupt flag.
●
●
0 - no interrupt.
1 - acknowledgment error interrupt: no detection of the dominant bit in acknowledge slot.
160
ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
