Renesas 16-bit single-chip microcomputer Manual De Usuario

Rev.1.02    Jul 01, 2005    page 212 of 314
REJ09B0126-0102

M16C/6N Group (M16C/6NL, M16C/6NN)

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 C0STR, C0RECR and C0TECR 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 C0CTLR 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.