參數(shù)資料
型號(hào): MC9S12XDT512VALR
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP112
封裝: LEAD FREE, LQFP-112
文件頁數(shù): 744/1348頁
文件大?。?/td> 7416K
代理商: MC9S12XDT512VALR
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 eld 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 Identier 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 Identier 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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