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| 型號(hào)： | MC68HC908QL2VDW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 2 MHz, MICROCONTROLLER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁(yè)數(shù)： | 78/244頁(yè) |
| 文件大?。?/td> | 3228K |
| 代理商： | MC68HC908QL2VDW |
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Slave LIN Interface Controller (SLIC)
Handling Command Message Frames
MC68HC908QL Family
Data Sheet
MOTOROLA
Slave LIN Interface Controller (SLIC)
169
The SLIC transmit go (TXGO) bit should be 0 for command frames, indicating to
the SLIC that data is coming from the master. The checksum mode control
(CHKMOD) bit allows the user to select which method of checksum calculation is
desired for this message frame. The LIN 1.3 checksum does not include the
identifier byte in the calculation, while the SAE version does include this byte. Since
the identifier is already received by the SLIC by this time, the default is to include
it in the calculation. If a LIN 1.3 checksum is desired, a 1 in the CHKMOD bit will
reset the checksum circuitry to begin calculating the checksum on the first data
byte. Using the CHKMOD bit in this way allows the SLIC to receive messages with
either method of data consistency check and change on a frame-by-frame basis. If
a system uses both types of data consistency checking methods, the software
must simply change the setting of this bit based on the identifier of each message.
If the network only uses one type of check, the CHKMOD bit can be set as a
constant value in the user’s code. If CHKMOD is not written on each frame, care
must be taken not to accidentally modify the bit when writing the data length and
TXGO bits. This is especially true if using C code without carefully inspecting the
output of the compiler and assembler.
The control bits and data length code are contained in one register, allowing the
user to maximize the efficiency of the identifier processing by writing a single byte
value to indicate the nature of the message frame. This allows very efficient
identifier processing code, which is important in a command frame, as the master
node can be sending data immediately following the identifier byte which might be
as little as one byte in length. The SLIC module uses a separate internal storage
area for the incoming data bytes, so there is no danger of losing incoming data, but
the user should spend as little time as possible within the ISR to ensure that the
application or other ISRs are able to use the majority of the CPU bandwidth.
The identifier must be processed in a maximum of 2 byte times on the LIN bus to
ensure that the ISR completes before the checksum would be received for the
shortest possible message. This should be easily achievable, as the only
operations required are to read the SLCID register and look up the checksum
method, data length, and command/request state of that identifier, then write that
value to the SLCDLC. This can be easily streamlined in code with a lookup table of
identifiers and corresponding SLCDLC bytes.
14.11.2 Extended Command 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. Since the SLIC module
can only receive 8 bytes at a time, the receive buffer must be emptied periodically
for long message frames. This is not standard LIN operation, and is likely only to
be used for downloading calibration data or reprogramming FLASH devices in a
factory or service facility, so the added steps required for processing are not 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.
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PDF描述 |
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| MC68HC908QL4CP | 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDIP16 |
| MC68HC908QL4MDW | 8-BIT, FLASH, 2 MHz, MICROCONTROLLER, PDSO16 |
| MC68HC908QL4CDT | 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO16 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC908QT1CDW | 功能描述:8位微控制器 -MCU 8 Bit 8MHz 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 |
| MC68HC908QT1CDWE | 制造商:Freescale Semiconductor 功能描述: |
| MC68HC908QT1CFQ | 制造商:Rochester Electronics LLC 功能描述:NITRON DFN - Bulk |
| MC68HC908QT1CP | 功能描述:IC MCU 1.5K FLASH 8-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC08 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C，IrDA，LIN，SPI，UART/USART 外圍設(shè)備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN，36-VFQFPN 包裝:托盤(pán) 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND |
| MC68HC908QT1CPE | 功能描述:8位微控制器 -MCU 1.5K FLASH W/O ADC 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 |
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