- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371076 > MC908QL2DT (Motorola, Inc.) Microcontrollers PDF資料下載
參數(shù)資料
| 型號(hào)： | MC908QL2DT |
| 廠商： | Motorola, Inc. |
| 英文描述： | Microcontrollers |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 160/222頁 |
| 文件大?。?/td> | 2861K |
| 代理商： | MC908QL2DT |
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頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁當(dāng)前第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁
Slave LIN Interface Controller (SLIC) Module
MC68HC908QL4 MC68HC908QL3 MC68HC908QL2 Data Sheet, Rev. 4
160
Freescale Semiconductor
The next SLIC interrupt which occurs, if unmasked, will indicate the end of the request message frame
and will either indicate that the frame was properly transmitted or that an error was encountered during
transmission. Refer to
14.9.9.4 Possible Errors on Request Message Data
for more detailed explanation
of these possible errors. This interrupt also signals to the application that the message frame is complete
and all data bytes and the checksum value have been properly transmitted onto the bus.
The SLIC module cannot begin to transmit the data until the user writes a 1 to TXGO, indicating that data
is ready. If the user writes TXGO without loading data into the transmit buffer, whatever data is in storage
will be transmitted, where the number of bytes transmitted is based on the data length value in the data
length register. Similarly, if the user writes the wrong value for the number of data bytes to transmit, the
SLIC will transmit that number of bytes, potentially transmitting garbage data onto the bus. The checksum
calculation is performed based on the data transmitted, and will therefore still be calculated.
The identifier must be processed, data must be loaded into the transmit buffer, and the SLCDLC value
written to initiate data transmission in a certain amount of time, based on the LIN specification. If the user
waits too long to start transmission, the master node will observe an idle bus and trigger a Slave Not
Responding error condition. The same error can be triggered if the transmission begins too late and does
not complete before the message frame times out. Refer to the LIN specification for more details on timing
constraints and requirements for LIN slave devices. This is especially important when dealing with
extended request frames, when the data must be loaded in 8 byte sections (maximum) to be transmitted
at each interrupt.
14.9.9.2 Extended Request Message Frames
Handling of extended frames is very similar to handling of standard frames, providing that the length is
less than or equal to 64 bytes. Because the SLIC module can only transmit 8 bytes at a time, the transmit
buffer must be loaded periodically for extended message frames. This is not standard LIN operation, and
is likely only to be used for special cases, so the added steps required for processing should not be as
critical to performance. During these types of operations, the application code is likely very limited in
scope and special adjustments can be made to compensate for added message processing time.
When handling extended request frames, it is important to clear the SLCF flag first, before loading any
data or writing TXGO. The data length is still written only one time, at the time the identifier is decoded,
along with the TXGO and CHKMOD bits, after the first 8 data bytes are loaded into the transmit buffer.
When this is done, a software counter must also be initialized to keep track of how many bytes are to be
transmitted in the message frame. The SLIC will generate an interrupt, if unmasked, after 8 bytes are
transmitted or an error is detected. At this interrupt, the SLCSV will indicate an error condition (in case of
byte framing error or bit error) or that the transmit buffer is empty. If the data is transmitted successfully,
the user must then clear the SLCF flag, subtract 8 from the software byte count, load the next 8 bytes into
the SLCD registers, and write a 1 to TXGO to tell the SLIC that the buffers are loaded and transmission
can commence. When this software counter reaches 8 or fewer, the remaining data bytes will fit in the
transmit buffer and the SLIC will automatically append the checksum value to the frame after the last byte
is sent.
NOTE
Do not write the CHKMOD or data length values in SLCDLC more than one
time per message frame
.
The SLIC tracks the number of sent or received
bytes based on the value written to this register at the beginning of the data
field and rewriting this register will corrupt the checksum calculation and
cause unpredictable behavior in the SLIC module
.
The application software
must track the number of sent or received bytes to know what the current
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC908QL2DW | Microcontrollers |
| MC908QL2M | Microcontrollers |
| MC908QL2V | Microcontrollers |
| MC908QL4DT | Microcontrollers |
| MC908QL4DW | Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC908QL2DW | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL2M | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL2V | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL3C | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL3CDWE | 功能描述:8位微控制器 -MCU NITRON LIN RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。