ST92F124 datasheet(351/429 Pages) STMICROELECTRONICS

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CONTROLLER AREA NETWORK (bxCAN)

CONTROLLER AREA NETWORK (Cont’d)

MAILBOX FILTER MATCH INDEX (MFMI)

This register is read only.

Reset Value: 0000 0000 (00h)

Bit 7:0 = FMI[7:0] Filter Match Index

This register contains the index of the filter the

message stored in the mailbox passed through.

For more details on identifier filtering please refer

to Section 10.10.5.4 - Filter Match Index para-

graph.

Note: This register is implemented only in receive

mailboxes. In transmit mailboxes, the MCSR reg-

ister is mapped at this location.

MAILBOX IDENTIFIER REGISTERS

(MIDR[3:0])

Read / Write

Reset Value: xxxx xxxx (xxh)

MIDR0

Bit 7 = Reserved. Forced to 0 by hardware.

Bit 6 = IDE Extended Identifier

This bit defines the identifier type of message in

the mailbox.

0: Standard identifier.

1: Extended identifier.

Bit 5 = RTR Remote Transmission Request

0: Data frame

1: Remote frame

Bit 4:0 = STID[10:6] Standard Identifier

5 most significant bits of the standard part of the

identifier.

MIDR1

Bit 7:2 = STID[5:0] Standard Identifier

6 least significant bits of the standard part of the

identifier.

Bit 1:0 = EXID[17:16] Extended Identifier

2 most significant bits of the extended part of the

identifier.

MIDR2

Bit 7:0 = EXID[15:8] Extended Identifier

Bit 15 to 8 of the extended part of the identifier.

MIDR3

Bit 7:1 = EXID[6:0] Extended Identifier

6 least significant bits of the extended part of the

identifier.

FMI7

FMI6

FMI5

FMI4

FMI3

FMI2

FMI1

FMI0

IDE

RTR

STID10

STID9

STID8

STID7

STID6

STID5

STID4

STID3

STID2

STID1

STID0

EXID17

EXID16

EXID15

EXID14

EXID13

EXID12

EXID11

EXID10

EXID9

EXID8

EXID7

EXID6

EXID5

EXID4

EXID3

EXID2

EXID1

EXID0

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