Datasheet

MSCAN Controller
Technical Data MC68HC912D60A — Rev. 3.1
328 MSCAN Controller Freescale Semiconductor
RTR — Remote transmission request
This flag reflects the status of the Remote Transmission Request bit
in the CAN frame. In the case of a receive buffer it indicates the status
of the received frame and supports the transmission of an answering
frame in software. In the case of a transmit buffer this flag defines the
setting of the RTR bit to be sent.
0 = Data frame
1 = Remote frame
17.12.3 Data Length Register (DLR)
This register keeps the data length field of the CAN frame.
DLC3 – DLC0 — Data length code bits
The data length code contains the number of bytes (data byte count)
of the respective message. At the transmission of a remote frame, the
data length code is transmitted as programmed while the number of
transmitted data bytes is always 0. The data byte count ranges from
0 to 8 for a data frame. Table 17-4 shows the effect of setting the DLC
bits.
Table 17-4. Data length codes
Data length code Data
byte
count
DLC3 DLC2 DLC1 DLC0
00000
00011
00102
00113
01004
01015
01106
01117
10008