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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.
7
0
FMI7
FMI6
FMI5
FMI4
FMI3
FMI2
FMI1
FMI0
7
0
0
IDE
RTR
STID10
STID9
STID8
STID7
STID6
7
0
STID5
STID4
STID3
STID2
STID1
STID0
EXID17
EXID16
7
0
EXID15
EXID14
EXID13
EXID12
EXID11
EXID10
EXID9
EXID8
7
0
EXID7
EXID6
EXID5
EXID4
EXID3
EXID2
EXID1
EXID0
9