SH7261 datasheet(851/1348 Pages) RENESAS

851 / 1348 page

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

Rev. 2.00 Sep. 07, 2007 Page 819 of 1312

REJ09B0320-0200

Important: Please note that, when this function is used, the RTR bit will never be set despite

receiving a Remote Frame. When a Remote Frame is received, the CPU will be notified by the

corresponding RFPR set, however, as RCAN-ET needs to transmit the current message as a Data

Frame, the RTR bit remains unchanged.

ATX

Description

Automatic Transmission of Data Frame disabled (Initial value)

Automatic Transmission of Data Frame enabled

DART (Disable Automatic Re-Transmission): When this bit is set, it disables the automatic re-

transmission of a message in the event of an error on the CAN bus or an arbitration lost on the

CAN bus. In effect, when this function is used, the corresponding TXCR bit is automatically set at

the start of transmission. When this bit is set to '0', RCAN-ET tries to transmit the message as

many times as required until it is successfully transmitted or it is cancelled by the TXCR.

DART

Description

Re-transmission enabled (Initial value)

Re-Transmission disabled

MBC[2:0] (Mailbox Configuration): These bits configure the nature of each Mailbox as follows.

When MBC = B'111, the Mailbox is inactive, i.e., it does not receive or transmit a message

regardless of TXPR or other settings. The MBC = B'110, B'101 and B'100 settings are prohibited.

When the MBC is set to any other value, the LAFM field becomes available. Please don't set

TXPR when MBC is set as reception. Similarly, please don't set TXPR, when MBC is set as

remote frame transmission and RTR in Mailbox is cleared. There is no hardware protection, and

TXPR remains set. MBC[1] of Mailbox-0 is fixed to "1" by hardware. This is to ensure that MB0

cannot be configured to transmit Messages.

SH7261 Datasheet(PDF) 851 Page - Renesas Technology Corp