Datasheet

Chapter 12 Freescale’s Controller Area Network (S08MSCANV1)
MC9S08DZ60 Series Data Sheet, Rev. 4
248 Freescale Semiconductor
12.4.4 Data Length Register (DLR)
This register keeps the data length field of the CAN frame.
76543210
R
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W
Reset: xxxxxxxx
Figure 12-33. Data Segment Registers (DSR0–DSR7) — Extended Identifier Mapping
Table 12-31. DSR0–DSR7 Register Field Descriptions
Field Description
7:0
DB[7:0]
Data bits 7:0
76543210
R
DLC3 DLC2 DLC1 DLC0
W
Reset: xxxxxxxx
= Unused; always read “x”
Figure 12-34. Data Length Register (DLR) — Extended Identifier Mapping
Table 12-32. DLR Register Field Descriptions
Field Description
3:0
DLC[3:0]
Data Length Code Bits — The data length code contains the number of bytes (data byte count) of the respective
message. During 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 12-33 shows the effect of setting the DLC bits.