MC9S12GRMV1 Datasheet, PDF (605/1292 Pages) Freescale Semiconductor, Inc – MC9S12G Family Reference Manual and Data Sheet

Module Base + 0x0010 to Module Base + 0x0013
7
R
AC7
W
6
AC6
5
AC5
Reset
0
0
0
Freescale’s Scalable Controller Area Network (S12MSCANV3)
Access: User read/write¹
4
3
2
1
0
AC4
AC3
AC2
AC1
AC0
0
0
0
0
0
Figure 18-20. MSCAN Identifier Acceptance Registers (First Bank) — CANIDAR0–CANIDAR3
1 _{Read: Anytime}
Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1)
Table 18-22. CANIDAR0–CANIDAR3 Register Field Descriptions
Field
7-0
AC[7:0]
Description
Acceptance Code Bits — AC[7:0] 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.
Module Base + 0x0018 to Module Base + 0x001B
Access: User read/write¹
7
R
AC7
W
Reset
0
6
AC6
0
5
AC5
0
4
AC4
0
3
AC3
0
2
AC2
0
1
AC1
0
0
AC0
0
Figure 18-21. MSCAN Identifier Acceptance Registers (Second Bank) — CANIDAR4–CANIDAR7
1 _{Read: Anytime}
Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1)
Table 18-23. CANIDAR4–CANIDAR7 Register Field Descriptions
Field
7-0
AC[7:0]
Description
Acceptance Code Bits — AC[7:0] 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.
18.3.2.18 MSCAN Identifier Mask Registers (CANIDMR0–CANIDMR7)
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 (AM[2:0]) 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 (AM[2:0])
in the mask registers CANIDMR1, CANIDMR3, CANIDMR5, and CANIDMR7 to “don’t care.”
MC9S12G Family Reference Manual, Rev.1.23
Freescale Semiconductor
607