2004 Microchip Technology Inc.
DS30491C-page 319
PIC18F6585/8585/6680/8680
23.2.6
CAN INTERRUPT REGISTERS
The registers in this section are the same as described
for convenience.
REGISTER 23-56: PIR3: PERIPHERAL INTERRUPT FLAG REGISTER
R/W-0
IRXIF
WAKIF
ERRIF
TXB2IF/
TXBnIF
TXB1IF(1) TXB0IF(1)
RXB1IF/
RXBnIF
RXB0IF/
FIFOWMIF
bit 7
bit 0
bit 7
IRXIF: CAN Invalid Received Message Interrupt Flag bit
1
= An invalid message has occurred on the CAN bus
0
= No invalid message on CAN bus
bit 6
WAKIF: CAN bus Activity Wake-up Interrupt Flag bit
1
= Activity on CAN bus has occurred
0
= No activity on CAN bus
bit 5
ERRIF: CAN bus Error Interrupt Flag bit
1
= An error has occurred in the CAN module (multiple sources)
0
= No CAN module errors
bit 4
When CAN is in Mode 0:
TXB2IF: CAN Transmit Buffer 2 Interrupt Flag bit
1
= Transmit Buffer 2 has completed transmission of a message and may be reloaded
0
= Transmit Buffer 2 has not completed transmission of a message
When CAN is in Mode 1 or 2:
TXBnIF: Any Transmit Buffer Interrupt Flag bit
1
= One or more transmit buffers has completed transmission of a message and may be reloaded
0
= No transmit buffer is ready for reload
bit 3
TXB1IF: CAN Transmit Buffer 1 Interrupt Flag bit(1)
1
= Transmit Buffer 1 has completed transmission of a message and may be reloaded
0
= Transmit Buffer 1 has not completed transmission of a message
bit 2
TXB0IF: CAN Transmit Buffer 0 Interrupt Flag bit(1)
1
= Transmit Buffer 0 has completed transmission of a message and may be reloaded
0
= Transmit Buffer 0 has not completed transmission of a message
bit 1
When CAN is in Mode 0:
RXB1IF: CAN Receive Buffer 1 Interrupt Flag bit
1
= Receive Buffer 1 has received a new message
0
= Receive Buffer 1 has not received a new message
When CAN is in Mode 1 or 2:
RXBnIF: Any Receive Buffer Interrupt Flag bit
1
= One or more receive buffers has received a new message
0
= No receive buffer has received a new message
bit 0
When CAN is in Mode 0:
RXB0IF: CAN Receive Buffer 0 Interrupt Flag bit
1
= Receive Buffer 0 has received a new message
0
= Receive Buffer 0 has not received a new message
When CAN is in Mode 1:
Unimplemented: Read as ‘0’
When CAN is in Mode 2:
FIFOWMIF: FIFO Watermark Interrupt Flag bit
1
= FIFO high watermark is reached
0
= FIFO high watermark is not reached
Note 1: In CAN Mode 1 and 2, this bit is forced to ‘0’.
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown