upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 622

• Manufacturer Part Number: upd70f3402
• Description: 32-/16-bit Single-chip Microcontroller With Can Interface
• Manufacturer: Renesas Electronics Corporation.

Caution:
Caution:
(b) Write
Caution:
622
Clear MOW
Clear DN
TRQ
RDY
DN
Set IE
0
1
0
1
0
1
Other than above
0
1
0
1
1
0
Figure 16-46: CAN Message Control Register m (CnMCTRLm) Format (2/3)
Do not set the DN bit to 1 by software. Be sure to write 0 to bit 10.
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.
Do not clear the RDY bit (0) during message transmission. Follow transmission abort
procedures in order to clear the RDY bit for redefinition.
The message buffer can be written by software. The CAN module cannot write to the message
buffer.
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.
No message frame transmitting request that is pending or being transmitted is in the message
buffer.
The message buffer is holding transmission of a message frame pending or is transmitting a
message frame.
A data frame or remote frame is not stored in the message buffer.
A data frame or remote frame is stored in the message buffer.
MOW bit is not changed.
MOW bit is cleared to 0.
DN bit is cleared to 0.
DN bit is not changed.
Clear IE
1
0
IE bit is cleared to 0.
IE bit is set to 1.
IE bit is not changed.
Chapter 16 FCAN Controller
User’s Manual U16702EE3V2UD00
Message buffer transmission request bit
Message buffer data update bit
Message buffer ready bit
Setting of MOW bit
Setting of DN bit
Setting of IE bit