mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 352

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 12 Freescale’s Scalable Controller Area Network (MSCANV2)
12.3.2.12 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
The IDHITx indicators are always related to the message in the foreground buffer (RxFG). When a
message gets shifted into the foreground buffer of the receiver FIFO the indicators are updated as well.
352
IDHIT[2:0]
IDAM[1:0]
Field
5:4
2:0
Reset:
W
R
Identifier Acceptance Mode — The CPU sets these flags to define the identifier acceptance filter organization
(see
mode, no message is accepted such that the foreground buffer is never reloaded.
Identifier Acceptance Hit Indicator — The MSCAN sets these flags to indicate an identifier acceptance hit (see
Section 12.4.3, “Identifier Acceptance
IDHIT2
IDAM1
Section 12.4.3, “Identifier Acceptance
0
0
Figure 12-13. MSCAN Identifier Acceptance Control Register (CANIDAC)
7
0
0
1
1
0
0
0
0
1
1
1
1
= Unimplemented
Table 12-18. CANIDAC Register Field Descriptions
Table 12-19. Identifier Acceptance Mode Settings
6
0
0
Table 12-20. Identifier Acceptance Hit Indication
IDHIT1
IDAM0
0
1
0
1
0
0
1
1
0
0
1
1
MC9S12HZ256 Data Sheet, Rev. 2.05
IDAM1
0
5
Filter”).
IDHIT0
Filter”).
0
1
0
1
0
1
0
1
IDAM0
Table 12-20
4
0
Description
Table 12-19
Identifier Acceptance Mode
Four 16-bit acceptance filters
Two 32-bit acceptance filters
Eight 8-bit acceptance filters
summarizes the different settings.
Filter closed
0
0
3
Identifier Acceptance Hit
summarizes the different settings. In filter closed
Filter 0 hit
Filter 1 hit
Filter 2 hit
Filter 3 hit
Filter 4 hit
Filter 5 hit
Filter 6 hit
Filter 7 hit
IDHIT2
2
0
Freescale Semiconductor
IDHIT1
0
1
IDHIT0
0
0