r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 761

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

(2)
This area is used as Local Acceptance Filter Mask (LAFM) for receive boxes.
LAFM: When MBC is set to 001, 010, 011 (Bin), this field is used as LAFM Field. It allows a
Mailbox to accept more than one identifier. The LAFM is comprised of two 16-bit read/write
areas as follows.
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]
0
1
Local Acceptance Filter Mask (LAFM)
H'104 + N * 32
H'106 + N * 32
LAFM
IDE_
15
14
0
Description
Corresponding STD_ID bit is cared
Corresponding STD_ID bit is "don't cared"
13
0
12
11
Figure 19.4 Acceptance Filter
10
9
EXTID_LAFM[15:0]
STDID_LAFM[10:0]
8
7
6
5
Section 19 Controller Area Network (RCAN-ET)
4
3
Rev. 1.00 Sep. 21, 2007 Page 735 of 1124
2
LAFM[17:16]
1
EXTID_
0
Word/LW
Word
REJ09B0402-0100
LAFM Field