參數(shù)資料
型號(hào): HC05V7GRS
英文描述: 68HC05V7 General Release Specification
中文描述: 68HC05V7一般版本規(guī)范
文件頁數(shù): 130/170頁
文件大?。?/td> 980K
代理商: HC05V7GRS
MOTOROLA
Page 116
SECTION 15: MESSAGE DATA LINK CONTROLLER
MC68HC05V7 Specification Rev. 1.0
15.5.3
J1850 VPW SYMBOLS
Variable Pulse Width Modulation (VPW) is an encoding technique in which each bit is
defined by the time between successive transitions, and by the level of the bus between
transitions, active or passive. Active and passive bits are used alternately.
Each logic one or logic zero contains a single transition, and can be at either the active or
passive level and one of two lengths, either 64
μ
s or 128
μ
s (T
NOM
at 10.4 kbps baud rate),
depending upon the encoding of the previous bit. The SOF, EOD, EOF and IFS symbols
will always be encoded at an assigned level and length. See
Figure 15-11: J1850 VPW
Symbols
Active
Each message will begin with an SOF symbol, an
active
symbol, and therefore each data
byte (including the CRC byte) will begin with a
passive
bit, regardless of whether it is a logic
one or a logic zero.
All VPW bit lengths stated in the following descriptions are typical values at a 10.4 kbps bit
rate.
128
μ
s
Passive
64
μ
s
OR
Logic "0"
(a)
128
μ
s
Active
Passive
64
μ
s
OR
Logic "1"
(b)
200
μ
s
Active
Passive
Start of Frame
(c)
200
μ
s
End of Data
(d)
280
μ
s
Active
Passive
End of Frame
(e)
280
μ
s
Break
(f)
Figure 15-11 : J1850 VPW Symbols
F
For More Information On This Product,
Go to: www.freescale.com
n
.
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