Datasheet

MSCAN Controller
Programmer’s Model of Message Storage
MC68HC912DT128A — Rev 4.0 Technical Data
MOTOROLA MSCAN Controller 349
RTR — Remote transmission request
This flag reflects the status of the Remote Transmission Request bit
in the CAN frame. In case of a receive buffer it indicates the status of
the received frame and allows to support the transmission of an
answering frame in software. In case of a transmit buffer this flag
defines the setting of the RTR bit to be sent.
0 = Data frame
1 = Remote frame
18.12.3 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 transmission of a remote frame, the
data length code is transmitted as programmed while the number of
transmitted bytes is always 0. The data byte count ranges from 0 to 8
for a data frame. Table 18-3 shows the effect of setting the DLC bits.
Table 18-3. Data length codes
Data length code Data
byte
count
DLC3 DLC2 DLC1 DLC0
00000
00011
00102
00113
01004
01015
01106
01117
10008
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