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參數(shù)資料
| 型號： | MC68HC708MP16 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 19/44頁 |
| 文件大?。?/td> | 342K |
| 代理商： | MC68HC708MP16 |
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Application Note
It Takes a Licking . . . Keeps on Ticking
AN1712
MOTOROLA
19
It Takes a Licking . . . Keeps on Ticking
Since the processor's oscillator circuit literally is the heartbeat of the
entire system, care must be taken to ensure that it is functioning properly
at all times. As of the time of this writing, at least one European
regulatory agency is considering a dead-oscillator test on a running
machine to observe the failure mode.
The clock generation module (CGM) on the HC08 Family has been
specifically designed to withstand the rugged requirements of industrial
applications. To this end, a phase-locked-loop (PLL) has been
implemented in the silicon, which yields a twofold advantage for
industrial applications:
1.
The clocking circuit is much more immune to noise spikes on the
crystal input. This is an important feature when considering that in
many motor drives, the processor is located very close to the
power switching devices. With the 'MP16, any noise spike on the
crystal input pin will be interpreted as a change of the input
frequency by the PLL, which will slowly adjust its output frequency
in the direction of the perceived frequency change. On a
processor without a phase-locked-loop, the noise spike could
cause a timing violation in the CPU state sequencer, which in turn
could crash the processor.
2.
The PLL has a special bit called the LOCK bit that can generate a
CPU interrupt informing it if phase lock has been lost. At this point,
the processor can test the crystal integrity via the crystal loss
detect bit and respond gracefully to the situation, taking the
appropriate actions. Note also that even if the external clock input
is lost completely, the PLL will continue to run at a frequency of
roughly one-third the VCO's center-of-range frequency.
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相關代理商/技術參數(shù) |
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| MC68HC711D3CFN2 | 功能描述:IC MCU 2MHZ 4K OTP 44-PLCC RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC11 其它有關文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標準包裝: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 外圍設備:DMA，PDR，POR，PVD，PWM，溫度傳感器，WDT 輸入/輸出數(shù):26 程序存儲器容量:64KB（64K x 8） 程序存儲器類型: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 |
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