SH7201 Datasheet, PDF (843/1196 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 19 Controller Area Network (RCAN-ET)
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
0
1
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
0
1
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.
Rev. 2.00 Sep. 07, 2007 Page 815 of 1164
REJ09B0321-0200