Can 0 message center 15 mask register 3 (c0m15m3), Can message center movx register descriptions – Maxim Integrated High-Speed Microcontroller Users Guide: Network Microcontroller Supplement User Manual
Page 144
High-Speed Microcontroller User’s
Guide: Network Microcontroller
Supplement
144
CAN 0 Message Center 15 Mask Register 3 (C0M15M3)
MOVX Address
1
7
6
5
4
3
2
1
0
xxxx0Fh
MASK4
MASK3
MASK2
MASK1
MASK0
0
0
0
CAN MESSAGE CENTER MOVX REGISTER DESCRIPTIONS
CAN 0 Message Center y Arbitration Register 0 (C0MyAR0)
CAN 0 Message Center y Arbitration Register 1 (C0MyAR1)
MASK28–MASK0
CAN message center 15 mask registers 0–3. These registers function as the mask for the standard
(EX/ST = 0) or extended (EX/ST = 1) global identification test (EX/ST = 1) when message ID masking
has been enabled (MEME = 1) for message center 15. These registers can only be modified during a
software initialization (SWINT = 1).
When EX/ST = 1, the 29 bits of the message ID are compared against the 29 bits of the CAN message
center 15 arbitration registers, using the 29 bits of the CAN message center 15 mask registers as mask.
When EX/ST = 0, the 11 bits of the message ID are compared against the most significant 11 bits of the
CAN message center 15 arbitration registers, using the most significant 11 bits of the CAN message
center 15 mask registers as a mask. Any bit in the CAN 0 message center 15 mask registers set to 0
ignores the state of the corresponding bit in the incoming message ID field when performing the test.
Any bit in the CAN message center 15 mask registers set to 1 forces the state of the corresponding bit
in the incoming message ID field and CAN message center arbitration registers 0–3 to match before
considering the incoming message a match.
The 3 least significant bits in the CnM15M3 register are not used and do not perform any comparison
of these bit locations. A read of these bits always returns 0, and writes to these bits are ignored.
Programming all mask registers to 00h effectively disables the message center 15 ID test, accepting all
messages. As such, the message center 15 mask registers act as a “don’t care” following a system
reset.
MOVX Address
1
7
6
5
4
3
2
1
0
xxxxy2h
ID28
ID27
ID26
ID25
ID24
ID23
ID22
ID21
MOVX Address
1
7
6
5
4
3
2
1
0
Xxxxy3h
ID20
ID19
ID18
ID17
ID16
ID15
ID14
ID13
CAN 0 Message Center y Arbitration Register 2 (C0MyAR2)
MOVX Address
1
7
6
5
4
3
2
1
0
Xxxxy4h
ID12
ID11
ID10
ID9
ID8
ID7
ID6
ID5
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