mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 328
mc9s12xs128
Manufacturer Part Number
mc9s12xs128
Description
Hcs12 Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XS128.pdf
(738 pages)
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Freescale’s Scalable Controller Area Network (S12MSCANV3)
11.3.3.3
This register keeps the data length field of the CAN frame.
11.3.3.4
This register defines the local priority of the associated message buffer. The local priority is used for the
internal prioritization process of the MSCAN and is defined to be highest for the smallest binary number.
The MSCAN implements the following internal prioritization mechanisms:
328
Module Base + 0x00XC
DLC[3:0]
Field
•
3-0
Reset:
All transmission buffers with a cleared TXEx flag participate in the prioritization immediately
before the SOF (start of frame) is sent.
W
R
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 11-35
Data Length Register (DLR)
Transmit Buffer Priority Register (TBPR)
Figure 11-35. Data Length Register (DLR) — Extended Identifier Mapping
7
x
DLC3
0
0
0
0
0
0
0
0
1
shows the effect of setting the DLC bits.
= Unused; always read “x”
6
x
Table 11-34. DLR Register Field Descriptions
S12XS Family Reference Manual, Rev. 1.10
DLC2
0
0
0
0
1
1
1
1
0
Table 11-35. Data Length Codes
Data Length Code
5
x
DLC1
4
x
0
0
1
1
0
0
1
1
0
Description
DLC3
x
3
DLC0
0
1
0
1
0
1
0
1
0
DLC2
2
x
Data Byte
Count
Freescale Semiconductor
DLC1
0
1
2
3
4
5
6
7
8
x
1
DLC0
0
x
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