MC68HC12 Datasheet, PDF (362/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit

MSCAN Controller
18.13.10 msCAN12 Identifier Acceptance Control Register (CIDAC)
CIDAC R
$0108 W
RESET
Bit 7
0
0
6
5
4
3
2
0
0
IDHIT2
IDAM1
IDAM0
0
0
0
0
0
1
IDHIT1
0
Bit 0
IDHIT0
0
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.
Table 18-8. Identifier Acceptance Mode Settings
IDAM1
0
0
1
1
IDAM0
0
1
0
1
Identifier Acceptance Mode
Two 32 bit Acceptance Filters
Four 16 bit Acceptance Filters
Eight 8 bit Acceptance Filters
Filter Closed
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.
Table 18-9. Identifier Acceptance Hit Indication
IDHIT2
0
0
0
0
1
1
1
1
IDHIT1
0
0
1
1
0
0
1
1
IDHIT0
0
1
0
1
0
1
0
1
Identifier Acceptance Hit
Filter 0 Hit
Filter 1 Hit
Filter 2 Hit
Filter 3 Hit
Filter 4 Hit
Filter 5 Hit
Filter 6 Hit
Filter 7 Hit
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.
Technical Data
362
MSCAN Controller
MC68HC912DT128A — Rev 4.0
MOTOROLA