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Chapter 16
FCAN Controller
User’s Manual U16702EE3V2UD00
16.12 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 cor-
responds 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.
Note:
The IE bit (message buffer interrupt enable bit) in the CnMCTRL register of the corresponding
message buffer has to be set to 1 for that message buffer to participate in the interrupt genera-
tion 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 transi-
tion from recessive to dominant).
Remark:
n = 0, 1
m = 0 to 31
Table 16-20:
List of CAN Module Interrupt Sources
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 mes-
sage 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 wake-up interrupt from CAN sleep
mode (Supplement 3)
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