Datasheet

MSCAN
Register Descriptions
MC9S12DP256 — Revision 1.1
MSCAN
Read: anytime
Write: anytime in Initialization Mode (INITRQ=1 and INITAK=1)
AC7–AC0 — Acceptance Code Bits
AC7–AC0 comprise a user defined sequence of bits with which the
corresponding bits of the related identifier register (IDRn) of the
receive message buffer are compared. The result of this comparison
is then masked with the corresponding identifier mask register.
MSCAN Identifier
Mask Registers
(CANIDMR0–7)
The identifier mask register specifies which of the corresponding bits in
the identifier acceptance register are relevant for acceptance filtering. To
receive standard identifiers in 32 bit filter mode, it is required to program
the last three bits (AM2–AM0) in the mask registers CANIDMR1 and
CANIDMR5 to ‘don’t care’. To receive standard identifiers in 16 bit filter
mode, it is required to program the last three bits (AM2–AM0) in the
mask registers CANIDMR1, CANIDMR3, CANIDMR5 and CANIDMR7
to ‘don’t care’.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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