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ST72561 bảng dữ liệu(PDF) 182 Page - STMicroelectronics

tên linh kiện ST72561
Giải thích chi tiết về linh kiện  8-BIT MCU WITH FLASH OR ROM, 10-BIT ADC, 5 TIMERS, SPI, LINSCI , ACTIVE CAN
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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ST72561 bảng dữ liệu(HTML) 182 Page - STMicroelectronics

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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
0
Identifier
1
Identifier
2
Identifier
n
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



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