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ST72561 Datasheet(PDF) 178 Page - STMicroelectronics

Part # ST72561
Description  8-BIT MCU WITH FLASH OR ROM, 10-BIT ADC, 5 TIMERS, SPI, LINSCI , ACTIVE CAN
PDF  262 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72561 Datasheet(HTML) 178 Page - STMicroelectronics

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beCAN CONTROLLER (Cont’d)
10.9.4.2 Reception Handling
For the reception of CAN messages, three
mailboxes organized as a FIFO are provided. In
order to save CPU load, simplify the software and
guarantee data consistency, the FIFO is managed
completely by hardware. The application accesses
the messages stored in the FIFO through the FIFO
output mailbox.
Valid Message
A received message is considered as valid when it
has been received correctly according to the CAN
protocol (no error until the last but one bit of the
EOF field) and It passed through the identifier fil-
tering successfully, see Section 10.9.4.3 "Identifier
Filtering".
Figure 101. Receive FIFO states
EMPTY
Valid Message
FMP=0x00
FOVR=0
PENDING_1
FMP=0x01
FOVR=0
Received
PENDING_2
FMP=0x10
FOVR=0
PENDING_3
FMP=0x11
FOVR=0
Valid Message
Received
Release
OVERRUN
FMP=0x11
FOVR=1
Mailbox
Release
Mailbox
Valid Message
Received
Valid Message
Received
Release
Mailbox
Release
Mailbox
Valid Message
Received
RFOM=1
RFOM=1
RFOM=1



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