![](http://datasheet.mmic.net.cn/Freescale-Semiconductor/MC68HC912B32CFU8_datasheet_98749/MC68HC912B32CFU8_226.png)
Byte Data Link Communications (BDLC)
M68HC12B Family Data Sheet, Rev. 9.1
226
Freescale Semiconductor
Figure 15-8. J1850 VPW Received Active Symbol Times
15.7.4.7 Invalid Active Bit
In
Figure 15-8(1), if the active-to-passive received transition beginning the next data bit (or symbol) occurs
between the passive-to-active transition beginning the current data bit (or symbol) and A, the current bit
would be invalid.
15.7.4.8 Valid Active Logic 1
In
Figure 15-8(2), if the active-to-passive received transition beginning the next data bit (or symbol) occurs
between A and B, the current bit would be considered a logic 1.
15.7.4.9 Valid Active Logic 0
In
Figure 15-8(3), if the active-to-passive received transition beginning the next data bit (or symbol) occurs
between B and C, the current bit would be considered a logic 0.
15.7.4.10 Valid SOF Symbol
In
Figure 15-8(4), if the active-to-passive received transition beginning the next data bit (or symbol) occurs
between C and D, the current symbol would be considered a valid SOF symbol.
A
BC
B
A
(1) INVALID ACTIVE BIT
(2) VALID ACTIVE LOGIC 1
(3) VALID ACTIVE LOGIC 0
64
s
128
s
CD
(4) VALID SOF SYMBOL
200
s
ACTIVE
PASSIVE
ACTIVE
PASSIVE
ACTIVE
PASSIVE
ACTIVE
PASSIVE