MC68HC58 Motorola, MC68HC58 Datasheet - Page 35
MC68HC58
Manufacturer Part Number
MC68HC58
Description
Data Link Controller
Manufacturer
Motorola
Datasheet
1.MC68HC58.pdf
(102 pages)
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3.1 J1850 Frame Format
MC68HC58
TECHNICAL DATA
IDLE
This section explains the frame format used to transmit and receive information on the
J1850 bus. Variable pulse width modulation (VPW) valid/invalid bits and symbols are
also discussed.
A J1850 bus message consists of one or more frames. Each frame is composed of
multiple symbols. Refer to Figure 3-1.
A symbol starts with a transition from either an active to a passive level, or a passive
to an active level. Symbols end with another transition, or the absence of a transition
after a specified time period. Figure 3-2 illustrates the representative symbols for a
J1850 message frame.
SOF
DATA
0
Figure 3-1 J1850 Bus Message Components
Figure 3-2 J1850 Bus Frame Format (VPW)
SECTION 3 J1850 FRAME FORMAT
DATA
SYMBOLS
FRAME
1
J1850 FRAME FORMAT
DATA
MESSAGE
SYMBOLS
FRAME
N
CRC
SYMBOLS
FRAME
E
O
D
NB
OPTIONAL
IFR
EOF
J1850 BUS FRAME FORMAT
J1850 BUS MESS COMP
MOTOROLA
F
S
I
IDLE
3-1