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S912XHZ512F1VAG Datasheet, PDF (527/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256 | |||
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Chapter 14 Freescaleâs Scalable Controller Area Network (S12MSCANV3)
Table 14-18. CANIDAC Register Field Descriptions
Field
Description
5-4
Identiï¬er Acceptance Mode â The CPU sets these ï¬ags to deï¬ne the identiï¬er acceptance ï¬lter organization
IDAM[1:0] (see Section 14.4.3, âIdentiï¬er Acceptance Filterâ). Table 14-19 summarizes the different settings. In ï¬lter closed
mode, no message is accepted such that the foreground buffer is never reloaded.
2-0
Identiï¬er Acceptance Hit Indicator â The MSCAN sets these ï¬ags to indicate an identiï¬er acceptance hit (see
IDHIT[2:0] Section 14.4.3, âIdentiï¬er Acceptance Filterâ). Table 14-20 summarizes the different settings.
IDAM1
0
0
1
1
Table 14-19. Identiï¬er Acceptance Mode Settings
IDAM0
0
1
0
1
Identiï¬er Acceptance Mode
Two 32-bit acceptance ï¬lters
Four 16-bit acceptance ï¬lters
Eight 8-bit acceptance ï¬lters
Filter closed
Table 14-20. Identiï¬er Acceptance Hit Indication
IDHIT2
0
0
0
0
1
1
1
1
IDHIT1
0
0
1
1
0
0
1
1
IDHIT0
0
1
0
1
0
1
0
1
Identiï¬er Acceptance Hit
Filter 0 hit
Filter 1 hit
Filter 2 hit
Filter 3 hit
Filter 4 hit
Filter 5 hit
Filter 6 hit
Filter 7 hit
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.
14.3.2.13 MSCAN Reserved Register
This register is reserved for factory testing of the MSCAN module and is not available in normal system
operating modes.
MC9S12XHZ512 Data Sheet Rev. 1.06
Freescale Semiconductor
527
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