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Fall

  • Input Signal Rise and Fall Tim

    All inputs of the C16x family have Schmitt-Trigger input characteristics. These Schmitt-Triggers are intended to always provide proper internal low and high levels, even if anundefined voltage level (between TTL-VIL and TTL-VIH) is externally applied to the pin.The hysteresis of these inputs, however, is very small, and can not be properly used in anapplication to suppress signal noise, and to shape slow rising/Falling input transitions.Thus, it must be taken care that rising/Falling input signals pass the undefined area of theTTL-specification between VIL and VIH with a sufficient rise/Fall time, as generally usualand specified for TTL components (e.g. 74LS series: gates 1V/us, clock inputs 20V/us).The effect of the implemented Schmitt-Trigger is that even if the input signal remains inthe undefined area, well defined low/high levels are generated internally. Note that allinput signals are evaluated at specific sample points (depending on the input and theperipheral function connected to it), at that signal transitions are detected if twoconsecutive samples show different levels. Thus, only the current level of an input signalat these sample points is relevant, that means, the necessary rise/Fall times of the inputsignal is only dependant on the sample rate, that is the distance in time between twoconsecutive evaluation time points. If an input signal, for instance, is sampled throughsoftware every 10us, it is irrelevant, which input level would be seen between thesamples. Thus, it would be allowable for the signal to take 10us to pass through theundefined area. Due to the sample rate of 10us, it is assured that only one sample canoccur while the signal is within the undefined area, and no incorrect transition will bedetected. For inputs which are connected to a peripheral function, e.g. capture inputs, thesample rate is determined by the clock cycle of the peripheral unit. In the case of theCAPCOM unit this means a sample rate of 400ns @ 20MHz CPU clock. This requiresinput signals to pass through the undefined area within these 400ns in order to avoidmultiple capture events.For input signals, which do not provide the required rise/Fall times, external circuitry mustbe used to shape the signal transitions.In the attached diagram, the effect of the sample rate is shown. The numbers 1 to 5 in thediagram represent possible sample points. Waveform a) shows the result if the inputsignal transition time through the undefined TTL-level area is less than the time distancebetween the sample points (sampling at 1, 2, 3, and 4). Waveform b) can be the result ifthe sampling is performed more than once within the undefined area (sampling at 1, 2, 5,3, and 4).Sample points:1. Evaluation of the signal clearly results in a low level2. Either a low or a high level can be sampled here. If low is sampled, no transition willbe detected. If the sample results in a high level, a transition is detected, and anappropriate action (e.g. capture) might take place.3. Evaluation here clearly results in a high level. If the previous sample 2) had alreadydetected a high, there is no change. If the previous sample 2) showed a low, atransition from low to high is detected now.

    標簽: Signal Input Fall Rise

    上傳時間: 2013-10-23

    上傳用戶:copu

  • MIT開放課件 6.856J / 18.416J Randomized Algorithms Fall 2002

    MIT開放課件 6.856J / 18.416J Randomized Algorithms Fall 2002

    標簽: Algorithms Randomized 18.416 6.856

    上傳時間: 2016-09-02

    上傳用戶:lijianyu172

  • MIT Course6.003 Signals and Systems, Fall 2003.rar MIT 開源課件

    MIT Course\6.003 Signals and Systems, Fall 2003.rar MIT 開源課件,信號與系統

    標簽: MIT Signals Systems Course

    上傳時間: 2013-12-31

    上傳用戶:qoovoop

  • Drop Fall algorithm used to segmentate digits

    Drop Fall algorithm used to segmentate digits

    標簽: segmentate algorithm digits Drop

    上傳時間: 2014-01-13

    上傳用戶:lijianyu172

  • This is balance and Fall article. It will be helpful for motor behavior and rehabilitation study.

    This is balance and Fall article. It will be helpful for motor behavior and rehabilitation study.

    標簽: rehabilitation and behavior balance

    上傳時間: 2017-07-18

    上傳用戶:xuanjie

  • This is balance and Fall article. It will be helpful for motor behavior and rehabilitation study.

    This is balance and Fall article. It will be helpful for motor behavior and rehabilitation study.

    標簽: rehabilitation and behavior balance

    上傳時間: 2017-07-19

    上傳用戶:cuiyashuo

  • rain-Fall, pointers, vectors

    rain-Fall, pointers, vectors

    標簽: rain-Fall pointers vectors

    上傳時間: 2014-08-26

    上傳用戶:BOBOniu

  • 介紹C16x系列微控制器的輸入信號升降時序圖及特性

    All inputs of the C16x family have Schmitt-Trigger input characteristics. These Schmitt-Triggers are intended to always provide proper internal low and high levels, even if anundefined voltage level (between TTL-VIL and TTL-VIH) is externally applied to the pin.The hysteresis of these inputs, however, is very small, and can not be properly used in anapplication to suppress signal noise, and to shape slow rising/Falling input transitions.Thus, it must be taken care that rising/Falling input signals pass the undefined area of theTTL-specification between VIL and VIH with a sufficient rise/Fall time, as generally usualand specified for TTL components (e.g. 74LS series: gates 1V/us, clock inputs 20V/us).The effect of the implemented Schmitt-Trigger is that even if the input signal remains inthe undefined area, well defined low/high levels are generated internally. Note that allinput signals are evaluated at specific sample points (depending on the input and theperipheral function connected to it), at that signal transitions are detected if twoconsecutive samples show different levels. Thus, only the current level of an input signalat these sample points is relevant, that means, the necessary rise/Fall times of the inputsignal is only dependant on the sample rate, that is the distance in time between twoconsecutive evaluation time points. If an input signal, for instance, is sampled throughsoftware every 10us, it is irrelevant, which input level would be seen between thesamples. Thus, it would be allowable for the signal to take 10us to pass through theundefined area. Due to the sample rate of 10us, it is assured that only one sample canoccur while the signal is within the undefined area, and no incorrect transition will bedetected. For inputs which are connected to a peripheral function, e.g. capture inputs, thesample rate is determined by the clock cycle of the peripheral unit. In the case of theCAPCOM unit this means a sample rate of 400ns @ 20MHz CPU clock. This requiresinput signals to pass through the undefined area within these 400ns in order to avoidmultiple capture events.

    標簽: C16x 微控制器 輸入信號 時序圖

    上傳時間: 2014-04-02

    上傳用戶:han_zh

  • MEMS 經典教材

    The field of microelectromechanical systems (MEMS), particularly micromachinedmechanical transducers, has been expanding over recent years, and the productioncosts of these devices continue to Fall. Using materials, fabrication processes, anddesign tools originally developed for the microelectronic circuits industry, newtypes of microengineered device are evolving all the time—many offering numerousadvantages over their traditional counterparts. The electrical properties of siliconhave been well understood for many years, but it is the mechanical properties thathave been exploited in many examples of MEMS. This book may seem slightlyunusual in that it has four editors. However, since we all work together in this fieldwithin the School of Electronics and Computer Science at the University of Southampton,it seemed natural to work together on a project like this. MEMS are nowappearing as part of the syllabus for both undergraduate and postgraduate coursesat many universities, and we hope that this book will complement the teaching thatis taking place in this area.

    標簽: MEMS 教材

    上傳時間: 2013-10-16

    上傳用戶:朗朗乾坤

  • Library of C functions that allows a program to use WinSock 2 functionality if it is available or fa

    Library of C functions that allows a program to use WinSock 2 functionality if it is available or Fall back to WinSock 1.1 if it isn t.

    標簽: functionality functions available Library

    上傳時間: 2015-01-18

    上傳用戶:LIKE

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