ST92F124 datasheet(337/429 Pages) 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)

0MCSR

MDLC

MIDR0

MIDR1

MIDR2

MIDR3

6MDAR0

7MDAR1

8MDAR2

9MDAR3

MDAR4

MDAR5

MDAR6

MDAR7

MTSR0

MTSR1

Offset to Receive

Mailbox base ad-

dress (bytes)

0MFMI

1MDLC

MIDR0

MIDR1

MIDR2

MIDR3

MDAR0

MDAR1

MDAR2

MDAR3

MDAR4

MDAR5

MDAR6

MDAR7

MTSR0

MTSR1

ST92F124 数据表(PDF) 337 Page - STMicroelectronics

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