Interrupt Function - NEC V850E/Dx3 Preliminary User's Manual

Chapter 19
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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
Interrupt status bit Interrupt enable bit
Name Register Name
Note
CINTS0 CnINTS CIE0
Note
CINTS1 CnINTS CIE1
CINTS2 CnINTS CIE2
CINTS3 CnINTS CIE3
CINTS4 CnINTS CIE4
CINTS5 CnINTS CIE5
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).
Preliminary User's Manual U17566EE1V2UM00
Interrupt
request
Register
signal
Message frame successfully transmitted from
CnIE INTCnTRX
message buffer m
Valid message frame reception in message
CnIE INTCnREC
buffer m
CAN module error state interrupt
CnIE INTCnERR
(Supplement 1)
CAN module protocol error interrupt
CnIE
(Supplement 2)
CnIE CAN module arbitration loss interrupt
CAN module wakeup interrupt from CAN
CnIE INTCnWUP
sleep mode (Supplement 3)
CAN Controller (CAN)
Interrupt source description