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CHAPTER 21 CAN CONTROLLER
Figure 21.4-23 Configuration of the Acceptance Mask Register 1 (AMR1)
■ Register Function
●
0: Compare
Compare the bit (be set to "0") of the acceptance code (ID register IDRx for comparing with the received
message ID) corresponding to this bit with the bit of the received message ID. If there is no match, no
message is received.
●
1: Mask
Mask the bit of the acceptance code ID register (IDRx) corresponding to this bit. No comparison is made
with the bit of the received message ID.
Notes:
• AMR0 and AMR1 should be set when all the message buffers (x) selecting AMR0 and AMR1 are
invalid (BVALx of the message buffer valid register (BVALR) is 0). Setting when the buffers are valid
(BVALx = 1) may cause unnecessary received messages to be stored.
• To invalidate the message buffer (by setting the BVALR: BVAL bit to 0) while the CAN controller is
operating for CAN communication (the read value of the CSR: HALT bit is 0 and the CAN controller is
operating for CAN bus communication to enable transmission and reception), follow the procedure in
"21.13 Precautions when Using CAN Controller".
Address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 AMR11(Byte0)
CAN1: 007D18
H
AM28 AM27 AM26 AM25 AM24 AM23 AM22 AM21 Reset value
XXXXXXXX
B
R/WR/WR/WR/WR/WR/WR/WR/W
Address bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 AMR11(Byte1)
CAN1: 007D19
H
AM20 AM19 AM18 AM17 AM16 AM15 AM14 AM13 Reset value
XXXXXXXX
B
R/WR/WR/WR/WR/WR/WR/WR/W
Address bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 AMR11(Byte2)
CAN1: 007D1A
H
AM12 AM11 AM10 AM9 AM8 AM7 AM6 AM5 Reset value
XXXXXXXX
B
R/WR/WR/WR/WR/WR/WR/WR/W
Address bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 AMR11(Byte3)
CAN1: 007D1B
H
AM4 AM3 AM2 AM1 AM0 −−−Reset value
XXXXXXXX
B
R/W R/W R/W R/W R/W −−−
R/W
X
−
: Read/Write
: Undefined
: Unused
: Used bit in typical frame format