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ST92F124 bảng dữ liệu(PDF) 337 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E3 TM(EMULATED EEPROM), CAN 2.0B AND J1850 BLPD
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ST92F124 bảng dữ liệu(HTML) 337 Page - STMicroelectronics

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CONTROLLER AREA NETWORK (bxCAN)
CONTROLLER AREA NETWORK (Cont’d)
10.10.5.5 Message Storage
The interface between the software and the hard-
ware for the CAN messages is implemented by
means of mailboxes. A mailbox contains all infor-
mation related to a message; identifier, data, con-
trol, status and time stamp information.
Transmit Mailbox
The software sets up the message to be transmit-
ted in an empty transmit mailbox. The status of the
transmission is indicated by hardware in the
MCSR register.
Transmit Mailbox Mapping
Receive Mailbox
When a message has been received, it is available
to the software in the FIFO output mailbox. Once
the software has handled the message (e.g. read
it) the software must release the FIFO output mail-
box by means of the RFOM bit in the CRFR regis-
ter to make the next incoming message available.
The filter match index is stored in the MFMI regis-
ter. The 16-bit time stamp value is stored in the
MTSR[0:1] registers.
Receive Mailbox Mapping
Offset to Transmit
Mailbox base ad-
dress (bytes)
Register Name
0MCSR
1
MDLC
2
MIDR0
3
MIDR1
4
MIDR2
5
MIDR3
6MDAR0
7MDAR1
8MDAR2
9MDAR3
10
MDAR4
11
MDAR5
12
MDAR6
13
MDAR7
14
MTSR0
15
MTSR1
Offset to Receive
Mailbox base ad-
dress (bytes)
Register Name
0MFMI
1MDLC
2
MIDR0
3
MIDR1
4
MIDR2
5
MIDR3
6
MDAR0
7
MDAR1
8
MDAR2
9
MDAR3
10
MDAR4
11
MDAR5
12
MDAR6
13
MDAR7
14
MTSR0
15
MTSR1
9



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