SH7261 datasheet(853/1348 Pages) RENESAS

853 / 1348 page

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

Rev. 2.00 Sep. 07, 2007 Page 821 of 1312

REJ09B0320-0200

19.3.3

Local Acceptance Filter Mask (LAFM)

This area is used as Local Acceptance Filter Mask (LAFM) for receive boxes.

LAFM: When MBC is set to B'001, B'010, B'011, this field is used as LAFM Field. The LAFM is

comprised of two 16-bit read/write areas as follows. It allows a Mailbox to accept more than one

identifier.

Word/LW

Word

H'104 + n

× 32

H'106 + n

× 32

MB[n].LAFMH

MB[n].LAFML

Address

Feld Name

Acces Size

LAFM Field

EXTID_

LAFM[17:16]

IDE_

LAFM

STDID_LAFM[10:0]

EXTID_LAFM[15:0]

Note: n = 0 to 15 (mailbox number)

Figure 19.4 Acceptance Filter

If a bit is set in the LAFM, then the corresponding bit of a received CAN identifier is ignored

when the RCAN-ET searches a Mailbox with the matching CAN identifier. If the bit is cleared,

then the corresponding bit of a received CAN identifier must match to the STDID/IDE/EXTID set

in the mailbox to be stored. The structure of the LAFM is same as the message control in a

Mailbox. If this function is not required, it must be filled with '0'.

Important: RCAN-ET starts to find a matching identifier from Mailbox-15 down to Mailbox-0.

As soon as RCAN-ET finds one matching, it stops the search. The message will be stored or not

depending on the NMC and RXPR/RFPR flags. This means that, even using LAFM, a received

message can only be stored into 1 Mailbox.

Important: When a message is received and a matching Mailbox is found, the whole message is

stored into the Mailbox. This means that, if the LAFM is used, the STDID, RTR, IDE and EXTID

may differ to the ones originally set as they are updated with the STDID, RTR, IDE and EXTID of

the received message.

STD_LAFM[10:0] — Filter mask bits for the CAN base identifier [10:0] bits.

STD_LAFM[10:0]

Description

Corresponding STD_ID bit is cared

Corresponding STD_ID bit is "don't cared"

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