ST72561 datasheet(182/262 Pages) STMICROELECTRONICS

부품명	ST72561

상세설명	8-BIT MCU WITH FLASH OR ROM, 10-BIT ADC, 5 TIMERS, SPI, LINSCI , ACTIVE CAN

PDF	262 Pages

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제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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ST72561

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beCAN CONTROLLER (Cont’d)

Figure 103. Filtering Mechanism - example

The example above shows the filtering principle of

the beCAN. On reception of a message, the iden-

tifier is compared first with the filters configured in

identifier list mode. If there is a match, the mes-

sage is stored in the FIFO and the index of the

matching filter is stored in the Filter Match Index.

As shown in the example, the identifier matches

with Identifier #2 thus the message content and

MFMI 2 is stored in the FIFO.

If there is no match, the incoming identifier is then

compared with the filters configured in mask

mode.

If the identifier does not match any of the identifi-

ers configured in the filters, the message is dis-

carded by hardware without software intervention.

Message Discarded

Identifier

n+1

Mask

Identifier

n+m

Mask

Identifier

Message Received

Ctrl

Data

Identifier #2 Match

Message

Stored

Receive FIFO

No Match

Found

n: number of single identifiers to receive

m: number of identifier groups to receive

n and m values depend on the configuration of the filters

ST72561 데이터시트(PDF) 182 Page - STMicroelectronics