MC9S08DZ96F2CLL datasheet(282/458 Pages) FREESCALE

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Chapter 12 Freescale’s Controller Area Network (S08MSCANV1)

MC9S08DZ128 Series Data Sheet, Rev. 1

282

Freescale Semiconductor

12.4.4

Data Length Register (DLR)

This register keeps the data length ﬁeld of the CAN frame.

76543210

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

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

DLC3

DLC2

DLC1

DLC0

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.

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