Hitachi H8S/2645, Hardware Manual

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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: 15 14 13 12 11 10 9 8
LAFML7 LAFML6 LAFML5 LAFML4 LAFML3 LAFML2 LAFML1 LAFML0
Initial value: 0 0 0 0 0 0 0 0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
Bit: 7 6 5 4 3 2 1 0
LAFML15 LAFML14 LAFML13 LAFML12 LAFML11 LAFML10 LAFML9 LAFML8
Initial value: 0 0 0 0 0 0 0 0
R/W: R/W R/W R/W R/W R/W R/W R/W R/W
LAFMH
Bit: 15 14 13 12 11 10 9 8
LAFMH7 LAFMH6 LAFMH5
— — —
LAFMH1 LAFMH0
Initial value: 0 0 0 0 0 0 0 0
R/W: R/W R/W R/W — — — R/W R/W
Bit: 7 6 5 4 3 2 1 0
LAFMH15 LAFMH14 LAFMH13 LAFMH12 LAFMH11 LAFMH10 LAFMH9 LAFMH8
Initial value: 0 0 0 0 0 0 0 0
R/W: R/W R/W R/W R/W R/W R/W R/W 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 Description
0 Stored in RX0 (receive-only mailbox) depending on bit match between RX0
message identifier and receive message identifier
(Initial value)
1 Stored in RX0 (receive-only mailbox) regardless of bit match between RX0
message identifier and receive message identifier
(x = 15 to 0)