mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 352
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mc9s12hz256v2
Manufacturer Part Number
mc9s12hz256v2
Description
Hcs12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12HZ256V2.pdf
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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
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