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TIM

  • 提升PCB設計能力的一本好書The Circuit Designers Companion

    The Circuit Designer’s Companion Second edition TIM Williams

    標簽: Designers Companion Circuit PCB

    上傳時間: 2013-11-04

    上傳用戶:fredguo

  • STM32F10xxx+TIM應用實例

    STM32全系列處理器具有腳對腳、外設及軟件的高度兼容性。這給應用帶來很好的靈活性,易于將應用升級到不同存儲空間或不同封裝的平臺。STM32處理器的產品全系列兼容,使得項目之間的代碼重用和移植很方便。

    標簽: STM xxx TIM 32

    上傳時間: 2013-11-12

    上傳用戶:zhengzg

  • 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

  • STM32筆記(二)TIM模塊產生PWM

    STM32

    標簽: STM PWM TIM 32

    上傳時間: 2013-10-13

    上傳用戶:jdm439922924

  • STM32筆記(一)TIM模塊定時器向上溢出-輸出比較

    STM32

    標簽: STM TIM 32 模塊

    上傳時間: 2014-10-30

    上傳用戶:tianyi996

  • 提升PCB設計能力的一本好書The Circuit Designers Companion

    The Circuit Designer’s Companion Second edition TIM Williams

    標簽: Designers Companion Circuit PCB

    上傳時間: 2013-10-08

    上傳用戶:sxdtlqqjl

  • 國外游戲開發者雜志2001年第八期配套代碼

    國外游戲開發者雜志2001年第八期配套代碼,包含TIM Schoeder在Volition Red Faction使用到的碰撞探測系統源代碼

    標簽: 2001 開發者 代碼

    上傳時間: 2013-12-21

    上傳用戶:蠢蠢66

  • K3:--- P1.6 K4:--- P1.7 BEEP:--- P3.7 K3 --- 控制按鍵 K4 --- 清零按鍵 開機顯示: SECOND-CLOCK 0 TIM

    K3:--- P1.6 K4:--- P1.7 BEEP:--- P3.7 K3 --- 控制按鍵 K4 --- 清零按鍵 開機顯示: SECOND-CLOCK 0 TIME 00:00:00:00 K3 --- 控制按鍵: 第一次按下時,開始計時。 顯示 BEGIN COUNT 1 TIME 00:00:01:88 第二次按下時,暫停計時。 顯示 PAUST COUNT 2 TIME 00:00:01:88 第三次按下時,累計計時。 顯示 BEGIN COUNT 3 TIME 00:08:08:88 第四次按下時,暫停計時。 顯示 PAUST COUNT 4 TIME 00:08:08:88 K4 --- 清零按鍵: 在任何狀態下,按一下K4,均可清零。 顯示 SECOND-CLOCK 0 TIME 00:00:00:00 0,1,2,3,4 表示按下K3鍵的次數。

    標簽: SECOND-CLOCK K3 BEEP K4

    上傳時間: 2014-01-14

    上傳用戶:515414293

  • 嵌入式系統開發 TOPPERS and JSP Kernel Release 1.3 TOPPERS = Toyohashi Open Platform for Embedded Real-TIM

    嵌入式系統開發 TOPPERS and JSP Kernel Release 1.3 TOPPERS = Toyohashi Open Platform for Embedded Real-TIMe Systems JSP = Just Standard Profile Kernel

    標簽: TOPPERS Toyohashi Embedded Platform

    上傳時間: 2013-12-26

    上傳用戶:清風冷雨

  • An example to accompany PCW March 2004 Visual Programming Hands On. To use, open the solution in

    An example to accompany PCW March 2004 Visual Programming Hands On. To use, open the solution in the SchoolApp folder. April 2004: Now revised to add New and Delete options. TIM Anderson http://www.itwriting.com/pcw/

    標簽: Programming accompany solution example

    上傳時間: 2015-12-09

    上傳用戶:qunquan

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