Interrupt Function; Table 18-1: List Of Can Module Interrupt Sources - NEC V850E/PH2 User Manual

18.12 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.
Interrupt status bit
No.
Name Register
1 CINTS0 CnINTS
2 CINTS1 CnINTS
3 CINTS2 CnINTS
4 CINTS3 CnINTS
5 CINTS4 CnINTS
6 CINTS5 CnINTS
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.
Notes: 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 reces-
sive to dominant).
Chapter 18 AFCAN Controller

Table 18-1: List of CAN module interrupt sources

Interrupt enable bit
Name Register
Note
CIE0 CnIE
Note
CIE1 CnIE
CIE2 CnIE
CIE3 CnIE
CIE4 CnIE
CIE5 CnIE
User's Manual U16580EE3V1UD00
Interrupt
request Interrupt source description
signal
Message frame successfully transmitted from
INTCnTRX
message buffer m
Valid message frame reception in message
INTCnREC
buffer m
CAN module error state interrupt
INTCnERR
(Supplement 1)
CAN module protocol error interrupt
(Supplement 2)
CAN module arbitration loss interrupt
CAN module wakeup interrupt from CAN
INTCnWUP
sleep mode (Supplement 3)
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