SH7261 datasheet(850/1348 Pages) RENESAS

850 / 1348 page

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

Rev. 2.00 Sep. 07, 2007 Page 818 of 1312

REJ09B0320-0200

• Mailbox-0

Bit:

Initial value:

R/W:

0000011100000000

R/W

NMC

MBC[2:0]

DLC[3:0]

Note:

MBC[1] of MB0 is always "1".

• Mailbox-15 to 1

Bit:

Initial value:

R/W:

0000011100000000

R/W

NMC

ATX DART

MBC[2:0]

DLC[3:0]

NMC (New Message Control): When this bit is set to '0', the Mailbox of which the RXPR or

RFPR bit is already set does not store the new message but maintains the old one and sets the

UMSR correspondent bit. When this bit is set to '1', the Mailbox of which the RXPR or RFPR bit

is already set overwrites with the new message and sets the UMSR correspondent bit.

Important: Please note that if a remote frame is overwritten with a data frame or vice versa could

be that both RXPR and RFPR flags (together with UMSR) are set for the same Mailbox. In this

case the RTR bit within the Mailbox Control Field should be relied upon.

NMC

Description

Overrun mode (Initial value)

Overwrite mode

ATX (Automatic Transmission of Data Frame): When this bit is set to '1' and a Remote Frame

is received into the Mailbox DLC is stored. Then, a Data Frame is transmitted from the same

Mailbox using the current contents of the message data and updated DLC by setting the

corresponding TXPR automatically. The scheduling of transmission is still governed by ID

priority or Mailbox priority as configured with the Message Transmission Priority control bit

(MCR.2). In order to use this function, MBC[2:0] needs to be programmed to be B'001. When a

transmission is performed by this function, the DLC (Data Length Code) to be used is the one that

has been received. Application needs to guarantee that the DLC of the remote frame correspond to

the DLC of the data frame requested.

Important: When ATX is used and MBC = B'001 the filter for the IDE bit cannot be used since

ID of remote frame has to be exactly the same as that of data frame as the reply message.

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