NEC V850E/PH2, User Manual

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Chapter 18 AFCAN Controller
User’s Manual U16580EE3V1UD00
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.
Table 18-1: List of CAN module interrupt sources
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).
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)