Datasheet

MSCAN Controller
Technical Data MC68HC912DT128A — Rev 4.0
362 MSCAN Controller MOTOROLA
18.13.10 msCAN12 Identifier Acceptance Control Register (CIDAC)
IDAM1 – IDAM0 — Identifier Acceptance Mode
The CPU sets these flags to define the identifier acceptance filter
organization (see Identifier Acceptance Filter). Table 18-7
summarizes the different settings. In Filter Closed mode no
messages will be accepted such that the foreground buffer will never
be reloaded.
IDHIT2 – IDHIT0 — Identifier Acceptance Hit Indicator
The msCAN12 sets these flags to indicate an identifier acceptance hit
(see Identifier Acceptance Filter). Table 18-7 summarizes the
different settings.
The IDHIT indicators are always related to the message in the
foreground buffer. When a message gets copied from the background to
the foreground buffer the indicators are updated as well.
NOTE: The CIDAC register can only be written if the SFTRES bit in CMCR0 is
set.
Bit 7654321Bit 0
CIDAC R 0 0
IDAM1 IDAM0
0 IDHIT2 IDHIT1 IDHIT0
$0108 W
RESET 0 0 0 00000
Table 18-8. Identifier Acceptance Mode Settings
IDAM1 IDAM0 Identifier Acceptance Mode
0 0 Two 32 bit Acceptance Filters
0 1 Four 16 bit Acceptance Filters
1 0 Eight 8 bit Acceptance Filters
1 1 Filter Closed
Table 18-9. Identifier Acceptance Hit Indication
IDHIT2 IDHIT1 IDHIT0 Identifier Acceptance Hit
0 0 0 Filter 0 Hit
0 0 1 Filter 1 Hit
0 1 0 Filter 2 Hit
0 1 1 Filter 3 Hit
1 0 0 Filter 4 Hit
1 0 1 Filter 5 Hit
1 1 0 Filter 6 Hit
1 1 1 Filter 7 Hit
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