M16C Datasheet, PDF (182/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
CAN Module
Acceptance Filter Support Register
• The Acceptance filter Support Register can be used for the implementation of efficient acceptance filter
rooutines.
Acceptance Filter Support Register
(b15)
b7
(b8)
b0 b7
b0 _Symbol
C0AFS
C1AFS
Address
024316, 024216
024516, 024416
When reset
indeterminate
indeterminate
Function
At write each bit corresponds to an standard identifier bit
of a received message object.
At read a modified form of the standard identifier is
obtained.
Values that can be set
Standard identifier in
word- or byte order
can be set.
RW
OO
Figure 18-21. Acceptance Filter Support Register
When writing the first two bytes of a received message object to the Acceptance Filter Support Register, the
bits are modified as illustrated in Figure 18-20. Therefore, when read, the obtained value can be used for an
efficient software acceptance filtering of the most recently written standard identifier. The message order that
the Acceptance Filter Support Register expects is the message order of the according CAN module.
Bit 15
When write
When read
Bit 15
Bit 8 Bit 7
SID₁₀ SID₉ SID₈ SID₇ SID₆
3/8 Decoder
Bit 0
SID₅ SID₄ SID₃ SID₂ SID₁ SID₀
Addresses
CAN0 / CAN1
242₁₆/244₁₆
Bit 8 Bit 7
Bit 0
SID₁₀ SID₉ SID₈ SID₇ SID₆ SID₅ SID₄ SID₃
242₁₆/244₁₆
Figure 18-22. Write/read of Acceptance Filter Support Register (word order)
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