Datasheet

Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV2)
Freescale Semiconductor MC9S12C-Family / MC9S12GC-Family 307
Rev 01.24
10.3.2.12 MSCAN Identifier Acceptance Control Register (CANIDAC)
The CANIDAC register is used for identifier acceptance control as described below.
Read: Anytime
Write: Anytime in initialization mode (INITRQ = 1 and INITAK = 1), except bits IDHITx, which are read-
only
Module Base + 0x000B
76543210
R0 0
IDAM1 IDAM0
0 IDHIT2 IDHIT1 IDHIT0
W
Reset: 00000000
= Unimplemented
Figure 10-15. MSCAN Identifier Acceptance Control Register (CANIDAC)
Table 10-16. CANIDAC Register Field Descriptions
Field Description
5:4
IDAM[1:0]
Identifier Acceptance Mode — The CPU sets these flags to define the identifier acceptance filter organization
(see Section 10.4.3, “Identifier Acceptance Filter”). Table 10-17 summarizes the different settings. In filter closed
mode, no message is accepted such that the foreground buffer is never reloaded.
2:0
IDHIT[2:0]
Identifier Acceptance Hit Indicator — The MSCAN sets these flags to indicate an identifier acceptance hit (see
Section 10.4.3, “Identifier Acceptance Filter”). Table 10-18 summarizes the different settings.
Table 10-17. Identifier Acceptance Mode Settings
IDAM1 IDAM0 Identifier Acceptance Mode
0 0 Two 32-bit acceptance filters
0 1 Four 16-bit acceptance filters
1 0 Eight 8-bit acceptance filters
1 1 Filter closed
Table 10-18. Identifier Acceptance Hit Indication
IDHIT2 IDHIT1 IDHIT0 Identifier Acceptance Hit
0 0 0 Filter 0 hit
0 0 1 Filter 1 hit
0 1 0 Filter 2 hit
0 1 1 Filter 3 hit
1 0 0 Filter 4 hit
1 0 1 Filter 5 hit
1 1 0 Filter 6 hit
1 1 1 Filter 7 hit