st92f124 STMicroelectronics, st92f124 Datasheet - Page 336
st92f124
Manufacturer Part Number
st92f124
Description
8/16-bit Single Voltage Flash Mcu Family With Ram, E3 Tmemulated Eeprom, Can 2.0b And J1850 Blpd
Manufacturer
STMicroelectronics
Datasheet
1.ST92F124.pdf
(426 pages)
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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.
336/426
9
Offset to Transmit
Mailbox base ad-
dress (bytes)
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
Transmit Mailbox Mapping
Register Name
MCSR
MDLC
MIDR0
MIDR1
MIDR2
MIDR3
MDAR0
MDAR1
MDAR2
MDAR3
MDAR4
MDAR5
MDAR6
MDAR7
MTSR0
MTSR1
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.
Offset to Receive
Mailbox base ad-
dress (bytes)
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
Receive Mailbox Mapping
Register Name
MFMI
MDLC
MIDR0
MIDR1
MIDR2
MIDR3
MDAR0
MDAR1
MDAR2
MDAR3
MDAR4
MDAR5
MDAR6
MDAR7
MTSR0
MTSR1
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