upd70f3402 Renesas Electronics Corporation., upd70f3402 Datasheet - Page 619

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

CnMCONFm OWS
(21) CAN message configuration register (CnMCONFm)
Note: The “message buffer that has already received a data frame” is a receive message buffer
Remark:
Note: The RTR bit specifies the type of message frame that is transmitted from a message buffer
The CnMCONFm register is used to specify the type of the message buffer and to set a mask.
OWS
MT2
RTR
whose DN bit has been set to 1.
defined as a transmit message buffer. Even if a valid remote frame has been received, RTR 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, MDLC[3:0] bits updated, and recorded to the receive history
list).
0
0
0
0
1
1
0
1
0
1
Figure 16-44: CAN Message Configuration Register (CnMCONFm) Format (1/2)
Other than above
A remote frame is received and stored, regardless of the setting of OWS and DN. A remote
frame that satisfies the other conditions (ID matches, RTR = 0, TRQ = 0) is always received
and stored in the corresponding message buffer (interrupt generated, DN flag set,
MDLC[3:0] bits updated, and recorded to the receive history list).
The message buffer
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.
Transmit a data frame.
Transmit a remote frame.
7
MT1
0
0
1
1
0
0
RTR
6
MT0
0
1
0
1
0
1
MT2
User’s Manual U16702EE3V2UD00
5
Note
Chapter 16 FCAN Controller
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 overwritten by a newly
MT1
4
Remote frame request bit
MT0
Overwrite control bit
3
Message buffer type setting bit
2
0
1
0
Note
MA0
0
see Table
Address R/W After reset
16-16
R/W undefined
619