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Chapter 16
FCAN Controller
User’s Manual U16702EE3V2UD00
Figure 16-46:
CAN Message Control Register m (CnMCTRLm) Format (2/3)
Caution:
Do not set the TRQ bit and RDY bit to 1 at the same time. Be sure to set the RDY bit to
1 before setting the TRQ bit to 1.
Caution:
Do not clear the RDY bit (0) during message transmission. Follow transmission abort
procedures in order to clear the RDY bit for redefinition.
(b) Write
Caution:
Do not set the DN bit to 1 by software. Be sure to write 0 to bit 10.
DN
Message buffer data update bit
0
A data frame or remote frame is not stored in the message buffer.
1
A data frame or remote frame is stored in the message buffer.
TRQ
Message buffer transmission request bit
0
No message frame transmitting request that is pending or being transmitted is in the message
buffer.
1
The message buffer is holding transmission of a message frame pending or is transmitting a
message frame.
RDY
Message buffer ready bit
0
The message buffer can be written by software. The CAN module cannot write to the message
buffer.
1
Writing the message buffer by software is ignored (except a write access to the RDY, TRQ, DN,
and MOW bits). The CAN module can write to the message buffer.
Clear MOW
Setting of MOW bit
0
MOW bit is not changed.
1
MOW bit is cleared to 0.
Set IE
Clear IE
Setting of IE bit
0
1
IE bit is cleared to 0.
1
0
IE bit is set to 1.
Other than above
IE bit is not changed.
Clear DN
Setting of DN bit
1
DN bit is cleared to 0.
0
DN bit is not changed.
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