Users Guide: Network Microcontroller Supplement User Manual

High-Speed Microcontroller User’s
Guide: Network Microcontroller
Supplement
144
CAN 0 Message Center 15 Mask Register 3 (C0M15M3)
MOVX Address
1
76543210
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
76543210
xxxxy2h ID28 ID27 ID26 ID25 ID24 ID23 ID22 ID21
MOVX Address
1
76543210
Xxxxy3h ID20 ID19 ID18 ID17 ID16 ID15 ID14 ID13
CAN 0 Message Center y Arbitration Register 2 (C0MyAR2)
MOVX Address
1
76543210
Xxxxy4h ID12 ID11 ID10 ID9 ID8 ID7 ID6 ID5
Maxim Integrated