upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 705

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

CAN Controller (CAN)
After reset: Undefined
CnMCONFm
Note
Note
(21)
OWS
7
CnMCONFm - CANn message configuration register m
The CnMCONFm register is used to specify the type of the message buffer
and to set a mask.
1.
2.
The RTR bit specifies the type of message frame that is transmitted from a
message buffer defined as a transmit message buffer. Even if a valid remote
frame has been received, the RTR bit of the transmit message buffer that has
received the frame remains cleared to 0. Even if a remote frame whose ID
matches has been received from the CAN bus with the RTR bit of the transmit
message buffer set to 1 to transmit a remote frame, that remote frame is not
received or stored (interrupt generated, DN flag set, the MDLC0 to MDLC3 bits
updated, and recorded to the receive history list).
Preliminary User’s Manual U17566EE1V2UM00
R/W
OWS
RTR
MT2
The “message buffer that has already received a data frame” is a receive
message buffer whose the CnMCTRLm.DN bit has been set to 1.
A remote frame is received and stored, regardless of the setting of the
OWS and DN bits. A remote frame that satisfies the other conditions (ID
matches, the RTR bit = 0, the CnMCTRLm.TRQ bit = 0) is always received
and stored in the corresponding message buffer (interrupt generated, DN
flag set, the CnMDLCm.MDLC0 to CnMDLCm.MDLC3 bits updated, and
recorded to the receive history list).
0
0
0
0
1
1
0
1
0
1
Other than above
RTR
Address: refer to “CAN registers overview“ on page 668
6
Overwrite control bit
The message buffer
overwritten by a newly received data frame. The newly received data
frame is discarded.
The message buffer that has already received a data frame is overwritten
by a newly received data frame.
Remote frame request bit
Transmit a data frame.
Transmit a remote frame.
MT1
0
0
1
1
0
0
MT2
5
MT0
0
1
0
1
0
1
MT1
Note
4
Message buffer type setting bit
Transmit message buffer
Receive message buffer (no mask setting)
Receive message buffer (mask 1 set)
Receive message buffer (mask 2 set)
Receive message buffer (mask 3 set)
Receive message buffer (mask 4 set)
Setting prohibited
that has already received a data frame is not
Note
MT0
3
2
0
1
0
Chapter 19
MA0
0
705