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(yè)數(shù): 36/102頁(yè)
文件大小: 700K
代理商: MC68HC58FN
MC68HC58
J1850 FRAME FORMAT
MOTOROLA
TECHNICAL DATA
3-5
3.1.10 Idle Bus
An idle condition exists on the J1850 bus after expiration of the IFS period. Any node
sensing an idle bus condition can begin transmission immediately.
Figure 3-3 J1850 VPW Symbols
3.2 J1850 VPW Valid/Invalid Bits and Symbols
The timing tolerances for receiving data bits and symbols from the J1850 bus allow for
variations in the system. The tolerances are balanced by making the maximum of one
symbol length approximately equal to the minimum length of the next longest symbol.
The difference between the symbol boundaries is equal to one clock period of the DLC
internal clock.
128
S
ACTIVE
PASSIVE
64
S
OR
LOGIC “0”
128
S
ACTIVE
PASSIVE
64
S
OR
LOGIC “1”
200
S
ACTIVE
PASSIVE
SOF
200
S
EOD
ACTIVE
PASSIVE
≥ 239S
BREAK
(A)
(B)
(C)
(D)
(E)
(F)
LAST TRANSITION
OF FRAME
IFS
EOF
EOD
300
S
280
S
200
S
J1850 VPW SYMBOLS
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