參數(shù)資料
型號: HC05V7GRS
英文描述: 68HC05V7 General Release Specification
中文描述: 68HC05V7一般版本規(guī)范
文件頁數(shù): 133/170頁
文件大?。?/td> 980K
代理商: HC05V7GRS
SECTION 15: MESSAGE DATA LINK CONTROLLER
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Page 119
15.5.4.5
Valid EOF & IFS Symbol
If the passive to active transition beginning the SOF symbol of the next message occurs
between
a
and
b
, the current symbol will be considered a valid EOF symbol. If the passive
to active transition beginning the SOF symbol of the next message occurs between
c
and
d
, the current symbol will be considered a valid EOF symbol followed by a valid IFS symbol.
All nodes must wait until a valid IFS symbol time has expired before beginning
transmission. However, due to variations in clock frequencies and bus loading, some nodes
may recognize a valid IFS symbol before others, and immediately begin transmitting.
Therefore, anytime a node waiting to transmit detects a passive to active transition once a
valid EOF has been detected, it should immediately begin transmission, initiating the
arbitration process. See Figure 15-13(1&2).
15.5.4.6
Idle Bus
If the passive to active transition beginning the SOF symbol of the next message does not
occur before
d,
the bus is considered to be idle, and any node wishing to transmit a
message may do so immediately.
c
d
(2) Valid EOF+
IFS Symbol
280
μ
s
580
μ
s
a
b
(1) Valid EOF
Symbol
Figure 15-13 : J1850 VPW EOF and IFS Symbols
Active
Passive
Active
Passive
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料
PDF描述
HC05 Bipolar Transistor; Transistor Polarity:Dual P Channel; Power Dissipation:20W; DC Current Gain Min (hfe):25; Collector Current:1A; DC Current Gain Max (hfe):200; Power (Ptot):20W
HC1-5502A-7 Subscriber Line Interface Circuit
HC4P-5502A-7 Subscriber Line Interface Circuit
HC1062A Low Voltage Telephone Speech Transmission Circuit / High/Low Level Mute
HC1198 Peripheral IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HC060WE1DS038B 制造商:TE Connectivity 功能描述:EC7174-000
HC060YW1DS038B 制造商:TE Connectivity 功能描述:EC7207-000
HC06B05000J0G 制造商:FCI 功能描述:OEM ITEM 505-5BNF-SPRING CLAMP SYSTEM
HC08 制造商:Texas Instruments 功能描述:
HC08100 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Breake Away Header .025(0.64mm) Square Posts