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ST72561J4-Auto bảng dữ liệu(PDF) 233 Page - STMicroelectronics

tên linh kiện ST72561J4-Auto
Giải thích chi tiết về linh kiện  Clock, reset and supply management
PDF  324 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST72561J4-Auto bảng dữ liệu(HTML) 233 Page - STMicroelectronics

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ST72561-Auto
beCAN controller (beCAN)
Doc ID 12370 Rev 8
233/324
Although the transmission of incorrect data will not cause problems at the CAN network
level, it can severely disturb the application. A transmit mailbox can be only modified by
software while it is in empty state (refer to Figure 100).
The filters must be deactivated before their value can be modified by software. The
modification of the filter configuration (scale or mode) can be done by software only in
initialization mode.
17.7
beCAN cell limitations
17.7.1
FIFO corruption
FIFO corruption occurs in the following case:
WHEN the beCAN RX FIFO already holds two messages (that is, FMP == 2)
AND the application releases the FIFO (with the instruction CRFR = B_RFOM;)
WHILE the beCAN requests the transfer of a new receive message into the FIFO (this lasts
one CPU cycle)
THEN the internal FIFO pointer is not updated
BUT the FMP bits are updated correctly
As the FIFO pointer is not updated correctly, this causes the last message received to be
overwritten by any incoming message. This means one message is lost as shown in the
example in Figure 109. The beCAN will not recover normal operation until a device reset
occurs.



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