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id="spi-d3752e6475-link"><span class="ph">Q</span>SPI 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="uart_user_guide-d3752e6561" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d3752e6561-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide.html" id="uart_user_guide-d3752e6561-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d3752e6645" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d3752e6645-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide.html" id="usb_user_guide-d3752e6645-link">USB 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e6715" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e6715-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/mac/mac_user_guide.html" id="id-d3752e6715-link">MAC 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d3752e6799" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d3752e6799-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d3752e6799-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://aicdocco/taskstopics/sdk/pwm/pwm_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">PWM 使用指南</h1>
|
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<div class="date inPage">16 May 2025</div><div style="color: gray;">
|
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Read time: 3 minute(s)
|
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</div>
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<div class="- topic/body body">
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_aw1_yh3_fdc" data-ofbid="id__table_aw1_yh3_fdc" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">术语定义</span></caption><colgroup><col/><col/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
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<th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e42__20250519091516">术语/缩略语</p></th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e46__20250519091516">定义及说明</p></th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e56__20250519091516">PWM</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e60__20250519091516">Pulse-Width Modulation，脉冲宽度控制，简称脉宽调制</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e67__20250519091516">EPWM</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e71__20250519091516">Enhanced Pulse-Width Modulation, 增强型脉冲宽度控制（<span class="- topic/ph ph">Luban-Lite</span> 中
|
||
EPWM 功能与 PWM 相同，如无特殊说明，两者通用）</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e81__20250519091516">TBC</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e85__20250519091516">Time Base Counter，时基计数器，用于产生锯齿波</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e92__20250519091516">占空比</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e96__20250519091516">PWM 信号中，高电平保持的时间 与 该 PWM 时钟周期的时间之比</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e103__20250519091516">分辨率</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e107__20250519091516">占空比最小能达到多少，如 8 位的 PWM 理论分辨率是 1:255</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e115__20250519091516">Up Count</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e119__20250519091516">增模式, 计数方式是递增计数，如从 0 计数到 80、之后又从 0 到 80（波形是锯齿波）</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e126__20250519091516">Down Count</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e130__20250519091516">减模式, 计数方式是递减计数，如从 80 计数到 0、之后又从 80 到 0（波形是锯齿波）</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e137__20250519091516">单斜率</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e141__20250519091516">单个方向的计数，增模式、减模式都属于单斜率</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e148__20250519091516">Up&Down Count</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e152__20250519091516">
|
||
<div class="- topic/div div">
|
||
<div class="- topic/div div"> 增减模式，计数方向有两个，如从 0 计数到 80、然后从 80 到 0（波形是三角波），</div>
|
||
<div class="- topic/div div"> 增、减两个过程合起来算一个周期</div>
|
||
</div>
|
||
</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_aw1_yh3_fdc__entry__1"><p class="- topic/p p" data-ofbid="d109904e168__20250519091516">双斜率</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_aw1_yh3_fdc__entry__2"><p class="- topic/p p" data-ofbid="d109904e172__20250519091516">两个方向的计数，增减模式属于双斜率</p></td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<section class="- topic/section section" id="id__section_w5l_rwn_4dc" data-ofbid="id__section_w5l_rwn_4dc"><h2 class="- topic/title title sectiontitle">PWM 工作原理</h2>
|
||
|
||
<ul class="- topic/ul ul" id="id__ul_kdh_twn_4dc" data-ofbid="id__ul_kdh_twn_4dc">
|
||
<li class="- topic/li li" data-ofbid="d109904e186__20250519091516">
|
||
<div class="- topic/div div section" id="id__id3">
|
||
<strong class="+ topic/ph hi-d/b ph b">PWM 信号</strong>
|
||
<p class="- topic/p p" data-ofbid="d109904e193__20250519091516"> PWM 信号通常由一列占空比不同的矩形脉冲构成，其占空比可以调节。用数字输出来控制 PWM
|
||
占空比，占空比提高意味着高电平脉宽增大，输出的能量就会增加，PWM 就相当于一个 <strong class="+ topic/ph hi-d/b ph b">功率版的 DA 转换模块</strong>。下图是一个典型的
|
||
PWM 信号波形：</p><figure class="- topic/fig fig fignone" id="id__id8" data-ofbid="id__id8">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_vwl_rwn_4dc" src="../../../images/pwm/pwm_wave.png" width="384" alt="pwm_wave1"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">典型的 PWM 信号波形</span></figcaption></figure><p class="- topic/p p" data-ofbid="d109904e209__20250519091516">占空比的计算方法： <code class="+ topic/ph pr-d/codeph ph codeph">占空比=(脉宽时间/周期)*100%</code></p><p class="- topic/p p" data-ofbid="d109904e213__20250519091516">结合上图，我们可以说：
|
||
脉宽时间 1 相比 脉宽时间 2 提供较小的占空比。</p><p class="- topic/p p" data-ofbid="d109904e215__20250519091516"> PWM 通常用于背光亮度调节、电机控制、舵机控制等。本文仅限于 PWM
|
||
调节背光的功能，通过调节 PWM 中的占空比，达到控制 LED 背光电流的通和断，进而可调整背光亮度。</p></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e219__20250519091516">
|
||
<div class="- topic/div div section" id="id__id4">
|
||
<strong class="+ topic/ph hi-d/b ph b">增模式</strong>
|
||
<p class="- topic/p p" data-ofbid="d109904e226__20250519091516"> 为了灵活调节 PWM
|
||
信号的占空比，要先想办法产生一个递增、或者递减的锯齿波信号，另外再结合一个比较器来跟一个阈值进行比较，当满足条件时进行电平反转，这样达到的效果就是通过调节“阈值”来调节了占空比。</p><p class="- topic/p p" data-ofbid="d109904e228__20250519091516">下图是由一个
|
||
<strong class="+ topic/ph hi-d/b ph b">递增变化</strong> 的锯齿波产生 PWM 信号的过程：</p><figure class="- topic/fig fig fignone" id="id__id9" data-ofbid="id__id9">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_wwl_rwn_4dc" src="../../../images/pwm/generate_pwm_up.png" alt="generate_pwm_up"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">由增模式锯齿波产生 PWM 信号的过程示意图</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d109904e245__20250519091516">图中 Tpwm 表示 PWM 信号的周期值，另外有 <strong class="+ topic/ph hi-d/b ph b">三个关键的时间点（下文简称关键时点）</strong>
|
||
（标注橙色圆圈，为了简洁只标注了最后一个周期）在下文中会频繁使用：</p><ul class="- topic/ul ul simple" id="id__ul_xwl_rwn_4dc" data-ofbid="id__ul_xwl_rwn_4dc">
|
||
<li class="- topic/li li" data-ofbid="d109904e252__20250519091516">
|
||
<dl class="- topic/dl dl simple" id="id__dl_ywl_rwn_4dc" data-ofbid="id__dl_ywl_rwn_4dc">
|
||
|
||
<dt class="- topic/dt dt dlterm" data-ofbid="d109904e258__20250519091516">ZRO</dt>
|
||
<dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d109904e263__20250519091516">Zero Point 的缩写，锯齿波的起始点</p>
|
||
</dd>
|
||
|
||
</dl>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e270__20250519091516">
|
||
<dl class="- topic/dl dl simple" id="id__dl_zwl_rwn_4dc" data-ofbid="id__dl_zwl_rwn_4dc">
|
||
|
||
<dt class="- topic/dt dt dlterm" data-ofbid="d109904e276__20250519091516">PRD</dt>
|
||
<dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d109904e281__20250519091516">Preiod Point 的缩写，锯齿波到达一个满周期的时间点</p>
|
||
</dd>
|
||
|
||
</dl>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e288__20250519091516">
|
||
<dl class="- topic/dl dl simple" id="id__dl_axl_rwn_4dc" data-ofbid="id__dl_axl_rwn_4dc">
|
||
|
||
<dt class="- topic/dt dt dlterm" data-ofbid="d109904e294__20250519091516">CMP</dt>
|
||
<dd class="- topic/dd dd">
|
||
<p class="- topic/p p" data-ofbid="d109904e299__20250519091516">Compare Point 的缩写，锯齿波到达了阈值的时间点，如上图中的 CMP 值为 7。</p>
|
||
</dd>
|
||
|
||
</dl>
|
||
</li>
|
||
</ul><div class="- topic/note note tip note_tip" id="id__note_kyl_qn3_ddc" data-ofbid="id__note_kyl_qn3_ddc"><span class="note__title">提示：</span>
|
||
<p class="- topic/p p" data-ofbid="d109904e308__20250519091516"> 实际上，PWM 模块支持设置两个 CMP 值：CMPA 和 CMPB。受限于 OS 中 PWM 子系统架构的接口设计，根据 duty
|
||
参数计算只能得到一个 CMP 值，所以 <strong class="+ topic/ph hi-d/b ph b">CMPB 和 CMPA 实际上数值保持一致</strong>。</p>
|
||
</div><p class="- topic/p p" data-ofbid="d109904e314__20250519091516">这些关键时点的触发行为 Action 有四种类型，详见 <a class="- topic/xref xref" href="pwm_config_lite.html">参数配置</a></p></div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e321__20250519091516">
|
||
<div class="- topic/div div section" id="id__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b">减模式</strong>
|
||
<p class="- topic/p p" data-ofbid="d109904e328__20250519091516">下图是由一个 <strong class="+ topic/ph hi-d/b ph b">递减变化</strong> 的锯齿波产生 PWM 信号的过程： </p><figure class="- topic/fig fig fignone" id="id__id10" data-ofbid="id__id10">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_bxl_rwn_4dc" src="../../../images/pwm/generate_pwm_down.png" alt="generate_pwm_down"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 3</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">由减模式锯齿波产生 PWM 信号的过程示意图</span></figcaption></figure>
|
||
</div>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e347__20250519091516">
|
||
<div class="- topic/div div section" id="id__id6">
|
||
<strong class="+ topic/ph hi-d/b ph b">增减模式</strong>
|
||
<p class="- topic/p p" data-ofbid="d109904e354__20250519091516">下图是由一个 <strong class="+ topic/ph hi-d/b ph b">同时有递减、递减变化</strong> 的锯齿波产生 PWM 信号的过程：</p><figure class="- topic/fig fig fignone" id="id__id11" data-ofbid="id__id11">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_cxl_rwn_4dc" src="../../../images/pwm/generate_pwm_up_down.png" alt="generate_pwm_updown.png"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 4</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">由增减模式锯齿波产生 PWM 信号的过程示意图</span></figcaption></figure><p class="- topic/p p" data-ofbid="d109904e370__20250519091516">比较以上三种模式的 PWM 产生过程，可以看到：</p><ul class="- topic/ul ul simple" id="id__ul_dxl_rwn_4dc" data-ofbid="id__ul_dxl_rwn_4dc">
|
||
<li class="- topic/li li" data-ofbid="d109904e374__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e376__20250519091516">三种模式可以产生同样效果的 PWM 信号</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e380__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e382__20250519091516">配置 ZRO、CMP（增减模式中有两处 CMP）、PRD 的触发行为（Action），可产生不同的 PWM 信号</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e386__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e388__20250519091516">CMP 的取值，直接决定了占空比，所以用户看到的 <strong class="+ topic/ph hi-d/b ph b">调节占空比就是通过调节 CMP 值来实现</strong></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e394__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e396__20250519091516">PRD 的值，决定了 PWM 信号的周期值 Tpwm</p>
|
||
</li>
|
||
</ul><div class="- topic/note note tip note_tip" id="id__note_lyl_qn3_ddc" data-ofbid="id__note_lyl_qn3_ddc"><span class="note__title">提示：</span>
|
||
<ol class="- topic/ol ol arabic simple" id="id__ol_exl_rwn_4dc" data-ofbid="id__ol_exl_rwn_4dc">
|
||
<li class="- topic/li li" data-ofbid="d109904e404__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e406__20250519091516">具体选择哪一种模式，要依据用户场景的需求特点，建议按 <strong class="+ topic/ph hi-d/b ph b">从简原则：首选相对简单的单斜率模式</strong>。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e413__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e415__20250519091516">为了简化使用，RTOS 中默认只使用 <strong class="+ topic/ph hi-d/b ph b">增模式</strong>。</p>
|
||
</li>
|
||
</ol>
|
||
</div></div>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section class="- topic/section section" id="id__section_rvr_rwn_4dc" data-ofbid="id__section_rvr_rwn_4dc"><h2 class="- topic/title title sectiontitle">PWM 功能简介</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id7">
|
||
<p class="- topic/p p" data-ofbid="d109904e434__20250519091516">PWM 的硬件设计，使用时基计数器产生上述的锯齿波信号，使用一个比较器可同时产生两路 PWM 信号。 PWM 模块的硬件原理图可简化如下：</p>
|
||
<figure class="- topic/fig fig fignone" id="id__id12" data-ofbid="id__id12">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_hwr_rwn_4dc" src="../../../images/pwm/pwm_hw_system.png" width="480" alt="pwm_hw_system"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 5</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">简化的 PWM 硬件框图</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d109904e449__20250519091516">PWM 模块共支持 4 个 PWM 通道，上图只画出了其中一个 PWM 通道，每个通道有 PWMx0 和 PWMx1 两个输出信号，对应 DTS 参数中的
|
||
action0 和 action1 配置。 <a class="- topic/xref xref" href="pwm_config_lite.html">参数配置</a></p>
|
||
<p class="- topic/p p" data-ofbid="d109904e455__20250519091516">PWM 模块支持的功能特性有：</p>
|
||
<ul class="- topic/ul ul simple" id="id__ul_iwr_rwn_4dc" data-ofbid="id__ul_iwr_rwn_4dc">
|
||
<li class="- topic/li li" data-ofbid="d109904e460__20250519091516">每个 PWM 通道可以产生 PWMx0 和 PWMx1 输出信号，配置规则如下：<div class="- topic/note note note note_note" id="id__note_myl_qn3_ddc" data-ofbid="id__note_myl_qn3_ddc"><span class="note__title">注：</span>
|
||
<p class="- topic/p p" data-ofbid="d109904e464__20250519091516">在用户手册 > 接口 > PWM 模块中，上述两个 PWM 输出信号被称作 PWMxA 和 PWMxB。为了避免和阈值 CMPA 和
|
||
CMPB 混淆，软件设计中将两个输出信号称作 PWMx0 和 PWMx1。</p>
|
||
</div><ul class="- topic/ul ul" id="id__ul_kwr_rwn_4dc" data-ofbid="id__ul_kwr_rwn_4dc">
|
||
<li class="- topic/li li" data-ofbid="d109904e469__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e471__20250519091516">两个独立的单边输出</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e475__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e477__20250519091516">两个独立的双边对称输出</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e481__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e483__20250519091516">一个独立的双边非对称输出</p>
|
||
</li>
|
||
</ul></li>
|
||
<li class="- topic/li li" data-ofbid="d109904e488__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e490__20250519091516">专用的 16 位可配置周期和频率的时基计数器（Time Base Counter）</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e494__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e496__20250519091516">系统时钟 100 MHz</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d109904e500__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d109904e502__20250519091516">多种事件可配置产生对应的中断</p>
|
||
</li>
|
||
</ul>
|
||
<div class="- topic/p p" data-ofbid="d109904e508__20250519091516">在 CMPA 和 CMPB 同时使用的情况下，锯齿波就会有两次和阈值的比较，共产生 4 个关键时点：<div class="table-container"><table class="- topic/table table frame-all" id="id__table_lwr_rwn_4dc" data-ofbid="id__table_lwr_rwn_4dc" data-cols="3"><caption></caption><colgroup><col style="width:29.673590504451035%"/><col style="width:35.311572700296736%"/><col style="width:35.01483679525222%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_lwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e525__20250519091516">锯齿波信号波段</p></th>
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_lwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e529__20250519091516">CMPA</p></th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_lwr_rwn_4dc__entry__3"><p class="- topic/p p" data-ofbid="d109904e533__20250519091516">CMPB</p></th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e543__20250519091516">增斜率段</p></td>
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_lwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e547__20250519091516">CAU (Compare A Up)</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_lwr_rwn_4dc__entry__3"><p class="- topic/p p" data-ofbid="d109904e551__20250519091516">CBU (Compare B Up)</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_lwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e558__20250519091516">减斜率段</p></td>
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_lwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e562__20250519091516">CAD (Compare A Down)</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_lwr_rwn_4dc__entry__3"><p class="- topic/p p" data-ofbid="d109904e566__20250519091516">CBD (Compare B Down)</p></td>
|
||
</tr>
|
||
</tbody></table></div></div>
|
||
<p class="- topic/p p" data-ofbid="d109904e573__20250519091516">以增减模式的锯齿波为例，共 6 个关键时点：</p>
|
||
<figure class="- topic/fig fig fignone" id="id__id13" data-ofbid="id__id13">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_mwr_rwn_4dc" src="../../../images/pwm/pwm_cmpa_cmpb.png" alt="cmpa_cmpb"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 6</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">增减模式的 6 个关键时点</span></figcaption></figure>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_nwr_rwn_4dc" data-ofbid="id__table_nwr_rwn_4dc" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">增减模式下关机时点的触发行为配置</span></caption><colgroup><col style="width:48.07692307692307%"/><col style="width:51.92307692307693%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_nwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e604__20250519091516">关键时点</p></th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_nwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e608__20250519091516">Action 类型</p></th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e618__20250519091516">CBD</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e622__20250519091516">none</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e629__20250519091516">CBU</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e633__20250519091516">none</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e640__20250519091516">CAD</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e644__20250519091516">high</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e651__20250519091516">CAU</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e655__20250519091516">none</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e662__20250519091516">PRD</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_nwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e666__20250519091516">low</p></td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_nwr_rwn_4dc__entry__1"><p class="- topic/p p" data-ofbid="d109904e674__20250519091516">ZRO</p></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_nwr_rwn_4dc__entry__2"><p class="- topic/p p" data-ofbid="d109904e678__20250519091516">low</p></td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<p class="- topic/p p" data-ofbid="d109904e685__20250519091516">关于行为类型定义，见 <a class="- topic/xref xref" href="pwm_config_lite.html">参数配置</a>。</p>
|
||
</div>
|
||
</section>
|
||
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#id__section_w5l_rwn_4dc" data-tocid="id__section_w5l_rwn_4dc">PWM 工作原理</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_rvr_rwn_4dc" data-tocid="id__section_rvr_rwn_4dc">PWM 功能简介</a></div></li></ul></div>
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