參數(shù)資料
型號: 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): 132/170頁
文件大?。?/td> 980K
代理商: HC05V7GRS
MOTOROLA
Page 118
SECTION 15: MESSAGE DATA LINK CONTROLLER
MC68HC05V7 Specification Rev. 1.0
In VPW bit encoding, the tolerances for the both passive and active data bits and symbols
are defined with no gaps between definitions. For example, the maximum length of a
passive logic zero is equal to the minimum length of a passive logic one, and the maximum
length of an active logic zero is equal to the minimum length of a valid SOF symbol
15.5.4.1
Invalid Passive Bit
If the passive to active transition beginning the next data bit or symbol occurs between the
active to passive transition beginning the current data bit or symbol and
a
, the current bit
would be invalid. See Figure 15-12(1).
15.5.4.2
Valid Passive Logic Zero
If the passive to active transition beginning the next data bit or symbol occurs between
a
and
b
, the current bit would be considered a logic zero. See Figure 15-12(2).
15.5.4.3
Valid Passive Logic One
If the passive to active transition beginning the next data bit or symbol occurs between
b
and
c
, the current bit would be considered a logic one. See Figure 15-12(3).
15.5.4.4
Valid EOD Symbol
If the passive to active transition beginning the next data bit or symbol occurs between
c
and
d
, the current symbol would be considered a valid EOD symbol. See Figure 15-12(4).
a
b
c
b
a
(1) Invalid Passive
Bit
(2) Valid Passive
Logic Zero
(3) Valid Passive
Logic One
64
μ
s
128
μ
s
Figure 15-12 : J1850 VPW Passive Symbols
c
d
(4) Valid EOD
Symbol
200
μ
s
Active
Passive
Active
Passive
Active
Passive
Active
Passive
F
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