- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45234 > MC68HC58FN (MOTOROLA INC) 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQCC28 PDF資料下載
參數(shù)資料
| 型號： | 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)： | 41/102頁 |
| 文件大?。?/td> | 700K |
| 代理商： | MC68HC58FN |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁當(dāng)前第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁
MC68HC58
J1850 FRAME FORMAT
MOTOROLA
TECHNICAL DATA
3-9
3.2.10 Valid SOF Symbol
If the active to passive transition beginning the next data bit or symbol occurs between
D and E, the current symbol is considered a valid SOF symbol. Refer to Figure 3-5 (4).
3.2.11 Valid BREAK Symbol
If the next active to passive transition does not occur between E and F, the current
symbol is considered a valid BREAK symbol. Following the BREAK symbol, an IFS
period must be observed, after which normal communication can resume on the J1850
bus. Refer to Figure 3-5 (5).
3.3 Frame Arbitration
Frame arbitration on the J1850 bus is accomplished in a non-destructive manner, al-
lowing the frame with the highest priority to be transmitted. Transmitters which lose ar-
bitration simply stop transmitting and wait for an idle J1850 bus to begin transmitting
again.
If the DLC wishes to transmit onto the J1850 bus, but detects that another frame is in
progress, it must wait until the J1850 bus is idle. However, if multiple nodes begin to
transmit in the same synchronization window, frame arbitration occurs beginning with
the first bit after the SOF symbol, and continues with each bit thereafter.
The VPW symbols and J1850 bus electrical characteristics are carefully chosen so
that a logic zero (active or passive type) always dominates over a logic one (active or
passive type) simultaneously transmitted. Hence logic zeros are said to be “dominant”
and logic ones are said to be “recessive”. Whenever a node detects a dominant bit
when it transmitted a recessive bit, it loses arbitration, and immediately stops transmit-
ting. This is known as “bitwise arbitration”. Refer to Figure 3-6.
Figure 3-6 J1850 VPW Bitwise Arbitration
TRANSMITTER A
TRANSMITTER B
J1850 BUS
SOF
DATA
BIT 1
DATA
BIT 4
DATA
BIT 5
“0”
TRANSMITTER A DETECTS
AN ACTIVE STATE ON
THE BUS, AND STOPS
TRANSMITTING
TRANSMITTER B WINS
PASSIVE
ACTIVE
PASSIVE
ACTIVE
PASSIVE
ACTIVE
“0”
“1”
DATA
BIT 2
“1”
DATA
BIT 3
“0”
“1”
ARBITRATION AND
CONTINUES
TRANSMITTING
J1850 BIT ARB
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68HC58DW | 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PDSO28 |
| MC68HC68T1P | 1 TIMER(S), REAL TIME CLOCK, PDIP16 |
| MC68HC705B16NVFNR2 | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC52 |
| MC68HC705B16NCFNR2 | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC52 |
| MC68HC705B16VFNR2 | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC52 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC68T1P | 制造商:Motorola Inc 功能描述: |
| MC68HC705B16CFN | 制造商:Motorola Inc 功能描述: |
| MC68HC705B16FN | 制造商:Rochester Electronics LLC 功能描述: |
| MC68HC705B16NB | 制造商:Rochester Electronics LLC 功能描述: |
| MC68HC705B16NCB | 制造商:Rochester Electronics LLC 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。