SH7261 datasheet(894/1348 Pages) RENESAS

894 / 1348 page

Section 19 Controller Area Network (RCAN-ET) [R5S72611] [R5S72613]

Rev. 2.00 Sep. 07, 2007 Page 862 of 1312

REJ09B0320-0200

• Normal Mode

RCAN-ET operates in the normal mode.

• Listen-Only Mode:

ISO-11898 requires this mode for baud rate detection. The Error Counters are cleared and

disabled so that the TEC/REC does not increase the values, and the CTx Output is disabled so

that RCAN-ET does not generate error frames or acknowledgment bits. IRR13 is set when a

message error occurs.

• Self Test Mode 1

RCAN-ET generates its own Acknowledge bit, and can store its own messages into a reception

mailbox (if required). The CRx/CTx pins must be connected to the CAN bus.

• Self Test Mode 2

RCAN-ET generates its own Acknowledge bit, and can store its own messages into a reception

mailbox (if required). The CRx/CTx pins do not need to be connected to the CAN bus or any

external devices, as the internal CTx is looped back to the internal CRx. CTx pin outputs only

recessive bits and CRx pin is disabled.

• Write Error Counter

TEC/REC can be written in this mode. RCAN-ET can be forced to become an Error Passive

mode by writing a value greater than 127 into the Error Counters. The value written into TEC

is used to write into REC, so only the same value can be set to these registers. Similarly,

RCAN-ET can be forced to become an Error Warning by writing a value greater than 95 into

them.

• Error Passive mode

RCAN-ET needs to be in Halt Mode when writing into TEC/REC (MCR1 must be "1" when

writing to the Error Counter). Furthermore this test mode needs to be exited prior to leaving

Halt mode.Error Passive Mode: RCAN-ET can be forced to enter Error Passive mode.

Note:

the REC will not be modified by implementing this Mode. However, once running in

Error Passive Mode, the REC will increase normally should errors be received. In this

Mode, RCAN-ET will enter BusOff if TEC reaches 256 (Dec). However when this mode

is used RCAN-ET will not be able to become Error Active. Consequently, at the end of the

Bus Off recovery sequence, RCAN-ET will move to Error Passive and not to Error Active

When message error occurs, IRR13 is set in all test modes.

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