mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 312

• Manufacturer Part Number: mc9s12q128
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Module Base + 0x0014 (CANIDMR0)
Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV2)
10.3.2.17 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.”
Read: Anytime
Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1)
312
AM[7:0]
Field
7:0
Reset
Reset
Reset
Reset
Figure 10-21. MSCAN Identifier Mask Registers (First Bank) — CANIDMR0–CANIDMR3
W
W
W
W
R
R
R
R
0x0015 (CANIDMR1)
0x0016 (CANIDMR2)
0x0017 (CANIDMR3)
Acceptance Mask Bits — If a particular bit in this register is cleared, this indicates that the corresponding bit in
the identifier acceptance register must be the same as its identifier bit before a match is detected. The message
is accepted if all such bits match. If a bit is set, it indicates that the state of the corresponding bit in the identifier
acceptance register does not affect whether or not the message is accepted.
0 Match corresponding acceptance code register and identifier bits
1 Ignore corresponding acceptance code register bit
AM7
AM7
AM7
AM7
0
0
0
0
7
7
7
7
Table 10-21. CANIDMR0–CANIDMR3 Register Field Descriptions
AM6
AM6
AM6
AM6
6
0
6
0
6
0
6
0
AM5
AM5
AM5
AM5
0
0
0
0
5
5
5
5
MC9S12Q128
Rev 1.09
AM4
AM4
AM4
AM4
4
0
4
0
4
0
4
0
Description
AM3
AM3
AM3
AM3
0
0
0
0
3
3
3
3
AM2
AM2
AM2
AM2
2
0
2
0
2
0
2
0
Freescale Semiconductor
AM1
AM1
AM1
AM1
0
0
0
0
1
1
1
1
AM0
AM0
AM0
AM0
0
0
0
0
0
0
0
0