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Chapter 19
CAN Controller (CAN)
Preliminary User’s Manual U17566EE1V2UM00
19.13 Interrupt Function
The CAN module provides 6 different interrupt sources.
The occurrence of these interrupt sources is stored in interrupt status
registers. Four separate interrupt request signals are generated from the six
interrupt sources. When an interrupt request signal that corresponds to two or
more interrupt sources is generated, the interrupt sources can be identified by
using an interrupt status register. After an interrupt source has occurred, the
corresponding interrupt status bit must be cleared to 0 by software.
Table 19-26
List of CAN module interrupt sources
Note
The CnMCTRL.IE bit (message buffer interrupt enable bit) of the
corresponding message buffer has to be set to 1 for that message buffer to
participate in the interrupt generation process.
Supplements
1.
This interrupt is generated when the transmission/reception error counter
is at the warning level, or in the error passive or bus-off state.
2.
This interrupt is generated when a stuff error, form error, ACK error, bit
error, or CRC error occurs.
3.
This interrupt is generated when the CAN module is woken up from the
CAN sleep mode because a falling edge is detected at the CAN reception
pin (CAN bus transition from recessive to dominant).
No.
Interrupt status bit
Interrupt enable bit
Interrupt
request
signal
Interrupt source description
Name
Register
Name
Register
1
CINTS0
CnINTS
CIE0
Note
CnIE
INTCnTRX
Message frame successfully transmitted from
message buffer m
2
CINTS1
CnINTS
CIE1
Note
CnIE
INTCnREC
Valid message frame reception in message
buffer m
3
CINTS2
CnINTS
CIE2
CnIE
INTCnERR
CAN module error state interrupt
(Supplement 1)
4
CINTS3
CnINTS
CIE3
CnIE
CAN module protocol error interrupt
(Supplement 2)
5
CINTS4
CnINTS
CIE4
CnIE
CAN module arbitration loss interrupt
6
CINTS5
CnINTS
CIE5
CnIE
INTCnWUP
CAN module wakeup interrupt from CAN
sleep mode (Supplement 3)
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