Wmt Manualgrup 006

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本文介绍STM32定时器的时钟源选择方法,包括内部时钟、外部时钟模式1和2等不同来源及其配置方式。 通过具体实例展示了如何使用这些时钟源进行频率计数。 STM32中有多达8个定时器,其中TIM1和TIM8是能够产生三对PWM互补输出的高级定时器,常用于三相电机的驱动,它们的时钟由APB2的输出产生。

Jul 29, 2025
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从时钟选择框图中可以看到,内部时钟源(CK_INT)来自RCC的TIMx_CLK,即定时器本身的驱动时钟。 当禁止从模式控制器(TIMx_SMCR寄存器的SMS=000),则预分频的时钟源CK_PSC. 时基单元简图(预分频器将时钟源3分频后输入给计数器) STM32的定时器之间也可以进行串联,一个定时器的输入可以作为另一个定时器的输入时钟。 这样就可以实现最大计. 知道定时器的时钟源频率我们用定时器做延时就很方便了,只要设定合适的分频系数即可,附一下用中断实现延时的公式:(摘自原子的STM32F4开发指南)

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本文重点介绍对STM32常规定时器的 时基单元 和 时钟源,希望您对 影子寄存器 的预装载及更新、时钟源有哪些、来自何处等有所了解。

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本文深入解析STM32定时器的时钟源配置、寄存器功能及初始化流程,结合实际代码示例,帮助开发者掌握定时器的核心概念与使用方法。

本文详细解析了STM32系列微控制器中不同定时器的时钟来源,包括高级定时器、通用定时器及基本定时器的时钟来源,并针对不同主频如168M和180M的情况,分析了APB1和APB2总线. 分为三类: 内部时钟(Internal Clock) → 使用主系统时钟(如 APB1 或 APB2 时钟)。 外部时钟(External Clock) → 通过 ETR(外部触发引脚)或 TIx(输入捕获通道)输入外部. 功能最齐全的高级定时器,可以选择多种时钟源输入,拥有四个独立通道,有输入捕获/输出比较功能,还有互补输出、刹车信号等独占功能

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