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class="shortdesc">SDMC、SPI NAND、SPI NOR<span class="ph"> 以及文件系统</span> 等存储模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_mcc_32s_nbc-d5856e3639" class="topicref" data-id="concept_mcc_32s_nbc" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_mcc_32s_nbc-d5856e3639-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-multi-media-sdk.html" id="concept_mcc_32s_nbc-d5856e3639-link">多媒体</a><div class="wh-tooltip"><p class="shortdesc">GE、VE、Display、DVP、MPP、MPP 播放器等多媒体模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d5856e4868" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_nww_hzh_pzb-d5856e4868-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d5856e4868-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN<span class="ph">、CAP</span>、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d5856e6083" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d5856e6083-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d5856e6083-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 concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/rtc/rtc-user-guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">RTC 使用指南</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d105411e24__20250121171540">Real Time Clock (RTC)
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模块用于日期时间的保存和更新，在无网络下为系统提供一份有效的日期和时间。通过备用电池供电，在断电场景下也可以一直计数和保存时间，同时还有闹钟唤醒的功能。<ul class="- topic/ul ul" id="concept_n2p_sn3_pzb__ul_ytr_qqs_c1c" data-ofbid="concept_n2p_sn3_pzb__ul_ytr_qqs_c1c"><li class="- topic/li li" data-ofbid="d105411e27__20250121171540">以秒为单位，最大支持 100 年跨度</li><li class="- topic/li li" data-ofbid="d105411e29__20250121171540">精度取决于晶振精度。RTC V1.0 支持校准，校准范围 ± 975 ppm（每百万次计数的误差）</li><li class="- topic/li li" data-ofbid="d105411e31__20250121171540">支持一路闹钟设置（可通过软件来扩展成多路闹钟），闹钟精确到秒</li><li class="- topic/li li" data-ofbid="d105411e33__20250121171540">闹钟支持输出一个中断信号（该信号也可以用于 32 KHz 时钟输出）给外部系统</li><li class="- topic/li li" data-ofbid="d105411e35__20250121171540">RTC V1.0 支持 128 bits 的系统数据备份，可用于掉电场景的数据保护</li></ul></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_n2p_sn3_pzb__table_sz4_pqs_c1c" data-ofbid="concept_n2p_sn3_pzb__table_sz4_pqs_c1c" data-cols="3"><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 style="width:33.33333333333333%"/><col style="width:33.33333333333333%"/><col style="width:33.33333333333333%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_n2p_sn3_pzb__table_sz4_pqs_c1c__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_n2p_sn3_pzb__table_sz4_pqs_c1c__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_n2p_sn3_pzb__table_sz4_pqs_c1c__entry__3">注释说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_n2p_sn3_pzb__table_sz4_pqs_c1c__entry__1">RTC</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_n2p_sn3_pzb__table_sz4_pqs_c1c__entry__2">Real Time Clock</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_n2p_sn3_pzb__table_sz4_pqs_c1c__entry__3">实时时钟</td></tr></tbody></table></div><section class="- topic/section section" id="concept_n2p_sn3_pzb__section_bxb_sqs_c1c" data-ofbid="concept_n2p_sn3_pzb__section_bxb_sqs_c1c"><h2 class="- topic/title title sectiontitle">低功耗设计</h2>
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<p class="- topic/p p" data-ofbid="d105411e65__20250121171540">RTC
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V1.0 控制器为了低功耗设计，选用 8bit APB 总线作为数据总线，带来的影响是相关的寄存器都是 8bit 格式。</p>
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<ul class="- topic/ul ul" id="concept_n2p_sn3_pzb__ul_mpq_sqs_c1c" data-ofbid="concept_n2p_sn3_pzb__ul_mpq_sqs_c1c"><li class="- topic/li li" data-ofbid="d105411e72__20250121171540">如果要设置一个 32bit 的秒数，就需要将其拆分成四个 8bit 写入四个寄存器。</li><li class="- topic/li li" data-ofbid="d105411e74__20250121171540">如果是读取秒数，就需要从四个寄存器的值组合成一个 32bit 数。</li></ul>
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<figure class="- topic/fig fig fignone" id="concept_n2p_sn3_pzb__fig_qgz_5qs_c1c" data-ofbid="concept_n2p_sn3_pzb__fig_qgz_5qs_c1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="concept_n2p_sn3_pzb__image_npq_sqs_c1c" src="../../../images/rtc/rtc_hw_structure.png" alt="hw_structure"/></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">RTC 模块的硬件原理框图</span></figcaption></figure>
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