NEC UPD703116 User Manual page 545

(2) CAN message data length registers 00 to 31 (M_DLC00 to M_DLC31)
The M_DLCn register sets the byte count in the data field of CAN message buffer n (n = 00 to 31). When
receiving, the receive data field's byte count is set (to 1).
These registers can be read/written in 8-bit units.
Caution When receiving a remote frame with an extended ID and storing it in the receive message
buffer, the values of DLC3 to DLC0 in the message buffer are cleared to 0 regardless of the
values of DLC3 to DLC0 on the CAN bus.
7
M_DLCn
Note
RFU RFU
(n = 00 to 31)
Bit position Bit name
3 to 0 DLC3 to
DLC0
Note RFU (Reserved for Future Use) indicates a reserved bit. Be sure to clear this bit to 0 when writing the
M_DLCn register.
CHAPTER 11 FCAN CONTROLLER
6 5 4
Note Note Note
RFU RFU
Control field data for setting the number of bytes in the data field
DLC3 DLC2
0 0
0 0
0 0
0 0
0 1
0 1
0 1
0 1
1 0
Other than above
User's Manual U14492EJ5V0UD
3 2 1
DLC3 DLC2 DLC1
Function
DLC1 DLC0 Data Length Code of Transmit/Receive
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
8 bytes regardless of the values of
DLC3 to DLC0
0 Address Initial value
DLC0 See Table 11-17 Undefined
Message
0 bytes
1 byte
2 bytes
3 bytes
4 bytes
5 bytes
6 bytes
7 bytes
8 bytes
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