参数资料
型号: MC908QL4MDWR2
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封装: 1.27 MM PITCH, MS-013AA, SOIC-16
文件页数: 59/226页
文件大小: 2911K
代理商: MC908QL4MDWR2
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页当前第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页第163页第164页第165页第166页第167页第168页第169页第170页第171页第172页第173页第174页第175页第176页第177页第178页第179页第180页第181页第182页第183页第184页第185页第186页第187页第188页第189页第190页第191页第192页第193页第194页第195页第196页第197页第198页第199页第200页第201页第202页第203页第204页第205页第206页第207页第208页第209页第210页第211页第212页第213页第214页第215页第216页第217页第218页第219页第220页第221页第222页第223页第224页第225页第226页
Initialization/Application Information
MC68HC908QL4 Data Sheet, Rev. 7
Freescale Semiconductor
151
either transmit or receive these bytes, depending upon the user code interpretation of the identifier byte.
Data is always transmitted into the data field least significant byte (LSB) first.
The SLIC module can automatically handle up to 64 bytes in extended LIN message frames without
significantly changing program execution.
14.9.3 LIN Checksum Field
The checksum field is a data integrity measure for LIN message frames, used to signal errors in data
consistency. The LIN 1.3 checksum calculation only covers the data field, but the SLIC module also
supports an enhanced checksum calculation which also includes the identifier field. For more information
on the checksum calculation, refer to 14.9.13 LIN Data Integrity Checking Methods.
14.9.4 SLIC Module Constraints
In designing a practical module, certain reasonable constraints must be placed on the LIN message traffic
which are not necessarily explicitly specified in the LIN specification. The SLIC module presumes that:
Timeout for no-bus-activity = 1 second.
14.9.5 SLCSV Interrupt Handling
Each change of state of the SLIC module is encoded in the SLIC state vector register (SLCSV). This is
an efficient method of handling state changes, indicating to the user not only the current status of the SLIC
module, but each state change will also generate an interrupt (if SLIC interrupts are enabled). For more
detailed information on the SLCSV, please refer to 14.8.6 SLIC State Vector Register.
In the software diagrams in the following subsections, when an interrupt is shown, the first step must
always be reading SLCSV to determine what is the current status of the SLIC module. Likewise, when the
diagrams indicate to “EXIT ISR”, the final step to exiting the interrupt service routine is to clear the SLCF
interrupt flag. This can only be done if the SLCSV has first been read, and in the case that data has been
received (such as an ID byte or command message data) the SLCD has been read at least one time.
After SLCSV is read, it will switch to the next pending state, so the user must be sure it is copied only once
into a software variable at the beginning of the interrupt service routine to avoid inadvertently clearing a
pending interrupt source. Additional decisions based on this value must be made from the software
variable, rather than from the SLCSV itself.
After exiting the ISR, normal application code may resume. If the diagram indicates to “RETURN TO
IDLE,” it indicates that all processing for the current message frame has been completed. If an error was
detected and the corresponding error code loaded into the SLCSV, any pending data in the data buffer
will be flushed out and the SLIC returned to its idle state, seeking out the next message frame header.
14.9.6 SLIC Module Initialization Procedure
14.9.6.1 LIN Mode Initialization
The SLIC module does not require very much initialization, due to its self-synchronizing design. Because
no prior knowledge of the bit rate is required to synchronize to the LIN bus, no programming of bit rate is
required.
At initialization time, the user must configure:
SLIC prescale register (SLIC digital receive filter adjustment).
Wait clock mode operation.
相关PDF资料
PDF描述
MC908QL4MDW 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
MC908QL4MDT 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
MC908QT1MDWE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
MC908QY2CDWE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
MC908QT2VFQE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8
相关代理商/技术参数
参数描述
MC908QL4V 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:Microcontrollers
MC908QL4VDTE 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC908QL4VDWE 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC908QT1 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC908QT1A 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Microcontrollers