Example 2:
Assume that a message with an
Extended Frame
is considered. The
Acceptance Code Registers (ACRn) and Acceptance Mask Registers (AMRn)
is set as follows.
n 0
1
2
3
(upper 6 bits
)
ACRn
1011 0100 1011 000x
1100 xxxx 0011 0xxx
0000 0000 0000 0001 0000 1111 0000 0111
AMRn
Accepted messages
1011 0100 1011 000x 1100 xxxx 0011 0x
(ID.28..ID.0 RTR)
(”x”=don’t care, only the upper 6 bits of ACR3 and AMR3 are used)
PISO-CAN/PEX-CAN/PCM-CAN Series User’s Manual (v2.6 Dec/2013) -------
83
In this case, the lower 2 bits of AMR3 and AMR3 are useless. All the other bits
of Acceptance Code and Acceptance Mask will be used for the 29-bit message
ID and the RTR bit. Therefore, no matter the CAN message is RTR (remote
transmit request) message or not, the message ID follows the format 1011
0100 1011 000x 1100 xxxx 0011 0x (x means “don’t care”) will be accepted.
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