參數(shù)資料
型號(hào)： MC68HC58FN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQCC28
封裝： PLASTIC, LCC-28
文件頁數(shù)： 32/102頁
文件大?。?/td> 700K
代理商： MC68HC58FN
MC68HC58
J1850 FRAME FORMAT
MOTOROLA
TECHNICAL DATA
3-1
SECTION 3 J1850 FRAME FORMAT
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.
3.1 J1850 Frame Format
A J1850 bus message consists of one or more frames. Each frame is composed of
multiple symbols. Refer to Figure 3-1.
Figure 3-1 J1850 Bus Message Components
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.
Figure 3-2 J1850 Bus Frame Format (VPW)
MESSAGE
FRAME
SYMBOLS
J1850 BUS MESS COMP
SOF
EOF
DATAN
CRC
IFR
IDLE
OPTIONAL
DATA1
DATA0
NB
J1850 BUS FRAME FORMAT
E
O
D
I
F
S
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