Renesas M16C User Manual

Rev.1.10    Jul 01, 2005    page 215 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

18. CAN Module

This document is under development and its contents are subject to change.

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.