UPD70F3116 Datasheet, PDF (547/826 Pages) NEC – 32-Bit Single-Chip Microcontrollers

CHAPTER 11 FCAN CONTROLLER
(3) CAN message control registers 00 to 31 (M_CTRL00 to M_CTRL31)
The M_CTRLn register is used to set the frame format of the data field in messages stored in CAN message
buffer n (n = 00 to 31).
These registers can be read/written in 8-bit units.
7
6
5
M_CTRLn
(n = 00 to 31)
RMDE1
RMDE0
ATS
(1/2)
4
3
2
1
0
Address Initial value
IE
MOVR RFU^{Notes 1, 2} RFU^{Notes 1, 3} RTR See Table 11-18 Undefined
Bit position Bit name
7
RMDE1
Function
Specifies operation of the DN flag when a remote frame is received on a transmit message
buffer.
0: DN flag not set when remote frame is received
1: DN flag set when remote frame is received
Cautions 1. When the RMDE1 bit is set, the setting of the RMDE0 bit is irrelevant.
2. If a remote frame arrives at the transmit message buffer when the
RMDE1 bit has not been set, the CPU is not notified, nor are other
operations performed.
6
RMDE0
Specifies setting/clearing status of remote frame auto acknowledge function.
0: Remote frame auto acknowledge function cleared
1: Remote frame auto acknowledge function set
Cautions 1. The RMDE0 bit’s setting is used only for transmit messages.
2. When the RTR bit has been set (to 1) (when the receive message or
transmit message has a remote frame), the RMDE0 bit is processed as
RMDE0 = 0. This prevents a worst-case scenario (in which
transmission of a remote frame draws a 100% bus load due to
reception of the same remote frame).
Notes 1.
2.
3.
RFU (Reserved for Future Use) indicates a reserved bit. Be sure to clear this bit to 0 when writing
the M_DLCn register.
The value of the r1 bit on the CAN bus is set during reception.
The value of the r0 bit on the CAN bus is set during reception.
Remark DN: Bit 2 of M_STATn register (see 11.10 (8) CAN message status registers 00 to 31
(M_STAT00 to M_STAT31))
User’s Manual U14492EJ5V0UD
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