mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 310

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

Module Base + 0x0010 (CANIDAR0)
Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV2)
10.3.2.16 MSCAN Identifier Acceptance Registers (CANIDAR0-7)
On reception, each message is written into the background receive buffer. The CPU is only signalled to
read the message if it passes the criteria in the identifier acceptance and identifier mask registers
(accepted); otherwise, the message is overwritten by the next message (dropped).
The acceptance registers of the MSCAN are applied on the IDR0–IDR3 registers (see
“Identifier Registers
“Identifier Acceptance
For extended identifiers, all four acceptance and mask registers are applied. For standard identifiers, only
the first two (CANIDAR0/1, CANIDMR0/1) are applied.
Read: Anytime
Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1)
310
AC[7:0]
Field
7:0
Figure 10-19. MSCAN Identifier Acceptance Registers (First Bank) — CANIDAR0–CANIDAR3
Reset
Reset
Reset
Reset
W
W
W
W
R
R
R
R
0x0011 (CANIDAR1)
0x0012 (CANIDAR2)
0x0013 (CANIDAR3)
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.
AC7
AC7
AC7
AC7
0
0
0
0
7
7
7
7
(IDR0–IDR3)”) of incoming messages in a bit by bit manner (see
Table 10-19. CANIDAR0–CANIDAR3 Register Field Descriptions
Filter”).
AC6
AC6
AC6
AC6
6
0
6
0
6
0
6
0
AC5
AC5
AC5
AC5
0
0
0
0
5
5
5
5
MC9S12Q128
Rev 1.09
AC4
AC4
AC4
AC4
4
0
4
0
4
0
4
0
Description
AC3
AC3
AC3
AC3
0
0
0
0
3
3
3
3
AC2
AC2
AC2
AC2
2
0
2
0
2
0
2
0
Freescale Semiconductor
AC1
AC1
AC1
AC1
Section 10.3.3.1,
Section 10.4.3,
0
0
0
0
1
1
1
1
AC0
AC0
AC0
AC0
0
0
0
0
0
0
0
0