MC68HC08AS20 Datasheet, PDF (337/386 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

ACTIVE
200 µs
128 µs
64 µs
PASSIVE
a
ACTIVE
PASSIVE
a
b
ACTIVE
PASSIVE
ACTIVE
b
c
PASSIVE
c
(1) INVALID ACTIVE BIT
(2) VALID ACTIVE LOGIC 1
(3) VALID ACTIVE LOGIC 0
(4) VALID SOF SYMBOL
d
Figure 20-9. J1850 VPW Received Active Symbol Times
Invalid Active Bit
In Figure 20-9(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.
Valid Active Logic 1
In Figure 20-9(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.
Valid Active Logic 0
In Figure 20-9(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.
MC68HC08AS20 — Rev. 4.1
Freescale Semiconductor
Advance Information
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