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<time title="创建时间：2025-04-05 12:45:22 / 修改时间：12:44:56" itemprop="dateCreated datePublished" datetime="2025-04-05T12:45:22+08:00">2025-04-05</time>
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<span>1 分钟</span>
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<h1 id="镜像">镜像</h1>
<h2 id="centos">Centos</h2>
<figure class="highlight sh"><figcaption><span>title:"centos8"</span></figcaption><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">curl -o /etc/yum.repos.d/Centos-vault-8.5.2111.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo</span><br><span class="line">curl -o /etc/yum.repos.d/epel-archive-8.repo https://mirrors.aliyun.com/repo/epel-archive-8.repo</span><br></pre></td></tr></table></figure>
<figure class="highlight sh"><figcaption><span>title:"centos7"</span></figcaption><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo</span><br></pre></td></tr></table></figure>
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<h2 id="晶振起振条件">晶振起振条件</h2>
<figure>
<img src="/images/PCB/OSC2.jpg" alt="OSC2.jpg">
<figcaption aria-hidden="true">OSC2.jpg</figcaption>
</figure>
<blockquote>
<p>补充：并联电阻不能太小，串联电阻不能太大。否则，在温度较低的情况下不易起振
1MΩ电阻适用于以下问题：
当发生程序启动慢或不运行时，建议给晶振并联1MΩ的电阻
在低温环境下振荡电路阻抗也会发生变化，当阻抗增加到一定程度时，晶振就会发生起振困难或不起振现象。这时，我们也需要给晶振并联1MΩ电阻</p>
</blockquote>
<h3 id="晶振参数以及匹配电容的计算">晶振参数以及匹配电容的计算</h3>
<p>负载电容</p>
<p><span class="math display">\[C_{L}\cong\frac{C_{G}*C_{D}}{C_{G}+C_{D}}+C_{S}\]</span></p>
<figure>
<img src="/images/PCB/OSC1.jpg" alt="OSC1.jpg">
<figcaption aria-hidden="true">OSC1.jpg</figcaption>
</figure>
<p>即负载电容跟晶体振荡电路输入管脚到GND的总电容CG
、晶体振荡电路输出管脚到GND的总电容CD以及晶体本身的并联电容CS有关。</p>
<p>我们知道晶体振荡电路输入管脚到GND的总电容一般由以下几部分组成，即：
1. 需要外加晶振的单片机或其他IC管脚到GND之间的寄生电容Ci； 2.
振荡输入端OSC_IN的PCB走线到GND之间的寄生电容Cpcb1； 3.
电路上额外需要增加的并联到GND的外匹配电容 CL1</p>
<p><span class="math display">\[C_{G}=C_{i}+C_{PCB1}+C_{L1}\]</span>
同样的，晶体振荡电路输出管脚到GND的总电容一般由以下几部分组成，即: 1.
需要外加晶振的单片机或者其他IC管脚到GND之间的寄生电容 Co 2.
振荡输出端OSC_OUT的PCB走线到GND之间的寄生电容Cpcb2 3.
电路上额外需要增加的并联到GND的外匹配电容 CL2</p>
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</main>
<footer class="footer">
<div class="footer-inner">
<div class="copyright">
© 2024-05 –
<span itemprop="copyrightYear">2025</span>
<span class="with-love">
<i class="fa fa-heart"></i>
</span>
<span class="author" itemprop="copyrightHolder">牧星</span>
</div>
<div class="wordcount">
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="fa fa-chart-line"></i>
</span>
<span title="站点总字数">1k</span>
</span>
<span class="post-meta-item">
<span class="post-meta-item-icon">
<i class="fa fa-coffee"></i>
</span>
<span title="站点阅读时长">5 分钟</span>
</span>
</div>
<div class="powered-by">由 <a href="https://hexo.io/" rel="noopener" target="_blank">Hexo</a> & <a href="https://theme-next.js.org/" rel="noopener" target="_blank">NexT.Gemini</a> 强力驱动
</div>
</div>
</footer>
<div class="toggle sidebar-toggle" role="button">
<span class="toggle-line"></span>
<span class="toggle-line"></span>
<span class="toggle-line"></span>
</div>
<div class="sidebar-dimmer"></div>
<div class="back-to-top" role="button" aria-label="返回顶部">
<i class="fa fa-arrow-up fa-lg"></i>
<span>0%</span>
</div>
<div class="reading-progress-bar"></div>
<noscript>
<div class="noscript-warning">Theme NexT works best with JavaScript enabled</div>
</noscript>
<script class="next-config" data-name="giscus" type="application/json">{"enable":true,"repo":"wanstarge/wanstarge.github.io","repo_id":"R_kgDOL4bc9Q","category":"General","category_id":"DIC_kwDOL4bc9c4Co6cd","mapping":"pathname","strict":0,"reactions_enabled":1,"emit_metadata":0,"theme":"light","lang":"zh-CN","crossorigin":"anonymous","input_position":"bottom","loading":"lazy"}</script>
<script>
document.addEventListener('page:loaded', () => {
if (!CONFIG.page.comments) return;
NexT.utils.loadComments('.giscus-container')
.then(() => NexT.utils.getScript('https://giscus.app/client.js', {
attributes: {
async : true,
crossOrigin : 'anonymous',
'data-repo' : CONFIG.giscus.repo,
'data-repo-id' : CONFIG.giscus.repo_id,
'data-category' : CONFIG.giscus.category,
'data-category-id' : CONFIG.giscus.category_id,
'data-mapping' : CONFIG.giscus.mapping,
'data-strict' : CONFIG.giscus.strict,
'data-reactions-enabled': CONFIG.giscus.reactions_enabled,
'data-emit-metadata' : CONFIG.giscus.emit_metadata,
'data-theme' : CONFIG.giscus.theme,
'data-lang' : CONFIG.giscus.lang,
'data-input-position' : CONFIG.giscus.input_position,
'data-loading' : CONFIG.giscus.loading
},
parentNode: document.querySelector('.giscus-container')
}));
});
</script>
</body>
</html>