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SC312XDP512F0MPVR датащи(PDF) 454 Page - Freescale Semiconductor, Inc

номер детали SC312XDP512F0MPVR
подробное описание детали  HCS12X Microcontrollers
PDF  1348 Pages
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производитель  FREESCALE [Freescale Semiconductor, Inc]
домашняя страница  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

SC312XDP512F0MPVR датащи(HTML) 454 Page - Freescale Semiconductor, Inc

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Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV3)
MC9S12XDP512 Data Sheet, Rev. 2.21
454
Freescale Semiconductor
10.3.3.3
Data Length Register (DLR)
This register keeps the data length field of the CAN frame.
Module Base + 0x0004 (DSR0)
0x0005 (DSR1)
0x0006 (DSR2)
0x0007 (DSR3)
0x0008 (DSR4)
0x0009 (DSR5)
0x000A (DSR6)
0x000B (DSR7)
76543210
R
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
W
Reset:
xxxxxxxx
Figure 10-34. Data Segment Registers (DSR0–DSR7) — Extended Identifier Mapping
Table 10-31. 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 10-35. Data Length Register (DLR) — Extended Identifier Mapping
Table 10-32. 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 10-33 shows the effect of setting the DLC bits.



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