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| 型號(hào)： | MC68HC908QL4VDT |
| 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： | TSSOP-16 |
| 文件頁數(shù)： | 95/244頁 |
| 文件大?。?/td> | 3228K |
| 代理商： | MC68HC908QL4VDT |
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Slave LIN Interface Controller (SLIC)
Data Sheet
MC68HC908QL Family
184
Slave LIN Interface Controller (SLIC)
MOTOROLA
In a particular system, it might also be possible to improve the opportunities for
trimming by utilizing system knowledge and use of the IMSG bit. If a message ID
is known to be considered a "don’t care" by this particular node, it should be safe
to trim the oscillator during that message frame (provided that it is safe for the
application software as well). After the software has done an identifier lookup and
determined that the ID corresponds to a "don’t care" message, the software might
choose to set the IMSG bit. From that time, the application software should have
at least one byte time of message traffic in which to trim the oscillator before that
ignored message frame expires, regardless of the state of the SLCACT bit. If the
length of that ignored message frame is known, that knowledge might also be
utilized to extend the time of this oscillator trimming opportunity.
Now that the mechanisms for recognizing when the SLIC module indicates safe
oscillator trimming opportunities are understood, it is important to understand how
to derive the information needed to perform the trimming.
The value in the SLCBT register will indicate how many SLIC clock cycles comprise
one bit time and for any given LIN bus speed, this will be a fixed value if the
oscillator is running at its ideal frequency. It is possible to use this ideal value
combined with the measured value in the SLCBT register to determine how to
adjust the oscillator of the microcontroller.
The actual oscillator trimming algorithm is very specific to each particular
implementation, and applications might or might not require the oscillator even to
be trimmed. The SLIC can maintain communications even with input oscillator
variation of ±50% (with 4 MHz nominal, that means that any input clock into the
SLIC from 2 MHz to 6 MHz will still guarantee communications). Since most
Motorola internal oscillators are at least within ±25% of their nominal value, even
when untrimmed, this means that trimming of the oscillator is not even required for
LIN communications. If the application can tolerate the range of frequencies which
might appear within this manufacturing range, then it is not necessary ever to trim
the oscillator. This can be a tremendous advantage to the customer, enabling
migration to very low-cost ROM devices which have no non-volatile memory in
which to store the trim value.
NOTE:
Even though most internal oscillators are within ±25% before trimming, they are
stable at some frequency in that range, within at least ±5% over the entire
operating voltage and temperature range. The trimming operation simply
eliminates the offset due to factory manufacturing variations to re-center the base
oscillator frequency to the nominal value. Please refer to the electrical
specifications for the oscillator for more specific information, as exact specifications
might differ from module to module.
14.20 Digital Receive Filter
The receiver section of the SLIC module includes a digital low-pass filter to remove
narrow noise pulses from the incoming message. An outline of the digital filter is
shown in Figure 14-30.
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| 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 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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