Users Guide: Network Microcontroller Supplement User Manual

High-Speed Microcontroller User’s
Guide: Network Microcontroller
Supplement
143
CAN 0 Extended Global Mask Register 3 (C0EGM3)
MOVX Address
1
7 6543210
xxxx0Bh MASK4 MASK3 MASK2 MASK1 MASK0 0 0 0
CAN 0 Message Center 15 Mask Register 0 (C0M15M0)
CAN 0 extended global mask registers 0–3. These registers function as the mask when performing
the extended global identification test (EX/ST= 1) when message ID masking is enabled (MEME = 1) for
message centers 1–14. When EX/ST= 0 or MEME = 0 for a given message center, the contents of this
register are ignored. These registers can be modified only 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 y arbitration registers, using the 29 bits of the CAN extended global mask registers as a mask.
Any bit in the extended global mask registers set to 0 ignores the state of the corr
esponding bit in the
incoming message ID field when performing the test. Any bit in the extended global mask registers set
to 1 forces the state of the corresponding bit in the incoming message ID field and CAN message cen-
ter arbitration r
egisters 0–3 to match before considering the incoming message a match.
The 3 least significant bits in the C0EGM3 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 global ID test for that message, accept-
ing all messages. As such, the global mask registers act as a “don’t care” following a system reset.
MOVX Address
1
76543210
xxxx0Ch
MASK28
MASK27
MASK26
MASK25
MASK24
MASK23
MASK22
MASK21
CAN 0 Message Center 15 Mask Register 1 (C0M15M1)
MOVX Address
1
76543210
xxxx0Eh
MASK12
MASK11
MASK10
MASK9 MASK8 MASK7 MASK6 MASK5
CAN 0 Message Center 15 Mask Register 2 (C0M15M2)
MOVX Address
1
76543210
xxxx0Eh
MASK12
MASK11
MASK10
MASK9 MASK8 MASK7 MASK6 MASK5
Maxim Integrated