MC68HC05X4 Datasheet, PDF (87/156 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Motorola CAN
Interface to the MC68HC05X4 CPU
MCAN
acceptance mask
register (CACM)
The acceptance mask register specifies which of the corresponding bits
in the acceptance code register are relevant for acceptance filtering.
NOTE: This register can be accessed only when the RR bit in CCNTRL is set.
Address: $0025
Bit 7
6
5
4
3
2
1
Bit 0
AM7
AM6
AM5
AM4
AM3
AM2
AM1
AM0
Reset:
Undefined
Figure 9. MCAN Acceptance Mask (CACM)
AM0 – AM7 — Acceptance mask bits
When a particular bit in this register is clear this indicates that the
corresponding bit in the acceptance code register must be the same
as its identifier bit, before a match will be detected. The message will
be accepted if all such bits match. When a bit is set, it indicates that
the state of the corresponding bit in the acceptance code register will
not affect whether or not the message is accepted.
1 = Ignore corresponding acceptance code register bit.
0 = Match corresponding acceptance code register and identifier
bits.
19-mcan
Motorola CAN
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MC68HC05X4 Rev 1.0