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Rev.2.00 Nov 28, 2005 page 236 of 378
REJ09B0124-0200
M16C/6N Group (M16C/6NK, M16C/6NM) 19. CAN Module
Under development
This document is under development and its contents are subject to change.
19.5.5 Bus Off State
The bus off state is entered according to the fault confinement rules of the CAN specification. When
returning to the CAN operation mode from the bus off state, the module has the following two cases.
In this time, the value of any CAN registers, except CiSTR, CiRECR and CiTECR registers, does not
change.
(1) When 11 consecutive recessive bits are detected 128 times
The module enters instantly into error active state and the CAN communication becomes possible
immediately.
(2) When the RetBusOff bit in the CiCTLR register = 1 (Force return from buss off)
The module enters instantly into error active state, and the CAN communication becomes possible
again after 11 consecutive recessive bits are detected.