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15.2.17 Local Acceptance Filter Masks (LAFML, LAFMH)
The local acceptance filter masks (LAFML, LAFMH) are 16-bit readable/writable registers that
filter receive messages to be stored in the receive-only mailbox (RX0) according to the identifier.
In these registers, consist of LAFMH15 (MSB) to LAFMH5 (LSB) are 11 standard/extended
identifier bits, and LAFMH1 (MSB) to LAFML0 (LSB) are 18 extended identifier bits.
LAFML
Bit:
Initial value:
R/W:
Bit:
LAFML15 LAFML14 LAFML13 LAFML12 LAFML11 LAFML10 LAFML9
Initial value:
R/W:
LAFMH
Bit:
Initial value:
R/W:
Bit:
LAFMH15 LAFMH14 LAFMH13 LAFMH12 LAFMH11 LAFMH10 LAFMH9 LAFMH8
Initial value:
R/W:
LAFMH Bits 7 to 0 and 15 to 13–11-Bit Identifier Filter (LAFMHx): Filter mask bits for the
first 11 bits of the receive message identifier (for both standard and extended identifiers).
Bit x: LAFMHx
0
1
556
15
14
LAFML7
LAFML6
LAFML5
0
0
R/W
R/W
7
6
0
0
R/W
R/W
15
14
LAFMH7
LAFMH6 LAFMH5
0
0
R/W
R/W
7
6
0
0
R/W
R/W
Description
Stored in RX0 (receive-only mailbox) depending on bit match between RX0
message identifier and receive message identifier
Stored in RX0 (receive-only mailbox) regardless of bit match between RX0
message identifier and receive message identifier
13
12
11
LAFML4
LAFML3
0
0
R/W
R/W
R/W
5
4
0
0
R/W
R/W
R/W
13
12
11
—
—
0
0
R/W
—
—
5
4
0
0
R/W
R/W
R/W
10
9
LAFML2
LAFML1
0
0
0
R/W
R/W
3
2
1
0
0
0
R/W
R/W
10
9
—
LAFMH1 LAFMH0
0
0
0
—
R/W
3
2
1
0
0
0
R/W
R/W
8
LAFML0
0
R/W
0
LAFML8
0
R/W
8
0
R/W
0
0
R/W
(Initial value)
(x = 15 to 0)
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