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http://www.cs.indiana.edu/~geobrown/book.pdf An example of a basic timer is illustrated in Figure 10.1. This timer has four components – a controller, a prescaler (PSC), an “auto-reload” register (ARR) and a counter (CNT). The function of the prescal…

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Timers get their clock source from External pins or Internal timer sources. External External = pins: TI1 or TI2 or ETR set pin to be used: in TIMx_CCMR1 reg - set pin to be used by writing CCxS bits select polarity of input in TIMx_CCER reg - write…

原文地址: http://blog.sina.com.cn/s/blog_49cb42490100s6ud.html   1.     STM32的Timer简介 STM32中一共有11个定时器,其中2个高级控制定时器,4个普通定时器和2个基本定时器,以及2个看门狗定时器和1个系统嘀嗒定时器.其中系统嘀嗒定时器是前文中所描述的SysTick,看门狗定时器以后再详细研究.今天主要是研究剩下的8个定时器. 定时器 计数器分辨率 计数器类型 预分频系数 产生DMA请求 捕获/比较通道 互补输出 TIM…

搞了两天单脉冲没搞定,无意中发现,这个利用主从模式的门控方式来控制一路PWM的输出长度很有效. //TIM2 PWM输出,由TIM4来控制其输出与停止 //frequency_tim2:TIM2 PWM输出周期:KHz //duty_tim2:TIM2 PWM占空比 0-100 //period_tim4: TIM4控制TIM2总周期,单位0.1ms //duty_tim4: TIM4控制TIM2输出时间,单位0.1ms void TIM2_CH3_PA2_PWM_TIM4_CH4_GATE(u…

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Auto-reload register (TIMx_ARR) The auto-reload register is preloaded. Writing to or reading from the auto-reload register accesses the preload register. The content of the preload register are transferred into the shadow register permanently or at e…

PWM输入检测是输入捕获的一个特例,可以测量频率与占空比 与输入捕获不同的是PWM输入模式会将同一个输入信号(TI1或TI2)连接到两个捕获装置(IC1和IC2).这两个捕获装置一个捕获上升沿一个捕获下降沿.TI1FP1.TI2FP2它们中的一个被选择为触发输入且从模式控制器被配置为复位模式. 注意:只有TI1FP1和TI2FP2连到了从模式控制器,所以PWM输入模式只能使用TIMx_CH1 /TIMx_CH2信号. //Timer4 CH2测周期,CH1测占空比,PB7引脚来输入 //这个捕捉…

How can you add extra hardware UARTs to a 32bit TMS470 ARM7-based microcontroller at zero cost? Solution: Designers can use the high-end timer (HET) peripheral found on all Texas Instruments ARM7-based, 32-bit TMS470 microcontrollers to implement add…