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<div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/624ee9626caf596192b5a1eb/bg1.jpg"><div class="c x1 y1 w2 h2"><div class="t m0 x2 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">1</div></div><div class="t m0 x3 h4 y3 ff2 fs1 fc0 sc0 ls0 ws0">DS12C8<span class="_ _0"></span>87使用手册</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>
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<div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/624ee9626caf596192b5a1eb/bg2.jpg"><div class="c x1 y1 w2 h2"><div class="t m0 x2 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">2</div></div><div class="t m0 x4 h5 y4 ff2 fs2 fc0 sc0 ls0 ws0">特点</div><div class="t m0 x4 h6 y5 ff3 fs3 fc0 sc0 ls0 ws0">•可作为<span class="_ _1"> </span>IBM<span class="_ _1"> </span>AT<span class="_ _1"> </span>计算机的时钟和日历</div><div class="t m0 x4 h6 y6 ff3 fs3 fc0 sc0 ls0 ws0">•与MC146818B和DS1287的管脚兼容</div><div class="t m0 x4 h6 y7 ff3 fs3 fc0 sc0 ls0 ws0">•在没有外部电源的情况下可工作10年</div><div class="t m0 x4 h6 y8 ff3 fs3 fc0 sc0 ls0 ws0">•自带晶体振荡器及电池</div><div class="t m0 x4 h6 y9 ff3 fs3 fc0 sc0 ls0 ws0">•可计算到2100年前的秒、分、小时、星期、日期、月、年七种日历信息并带闰年补偿</div><div class="t m0 x4 h6 ya ff3 fs3 fc0 sc0 ls0 ws0">•用二进制码或BCD码代表日历和闹钟信息</div><div class="t m0 x4 h6 yb ff3 fs3 fc0 sc0 ls0 ws0">•有12和24小时两种制式，12小时制时有AM和PM提示</div><div class="t m0 x4 h6 yc ff3 fs3 fc0 sc0 ls0 ws0">•可选用夏令时模式</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>
<div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://static.pudn.com/prod/directory_preview_static/624ee9626caf596192b5a1eb/bg3.jpg"><div class="c x1 y1 w2 h2"><div class="t m0 x2 h3 y2 ff1 fs0 fc0 sc0 ls0 ws0">3</div></div><div class="t m0 x4 h6 yd ff3 fs3 fc0 sc0 ls0 ws0">•可以应用于MOTOROLA和INTEL两种总线</div><div class="t m0 x4 h6 ye ff3 fs3 fc0 sc0 ls0 ws0">•数据/地址总线复用</div><div class="t m0 x4 h6 yf ff3 fs3 fc0 sc0 ls0 ws0">•内建128字节RAM，14字节时钟控制寄存器，114字节通用<span class="_ _1"> </span>RAM</div><div class="t m0 x4 h6 y10 ff3 fs3 fc0 sc0 ls0 ws0">•可编程方波输出</div><div class="t m0 x4 h6 y11 ff3 fs3 fc0 sc0 ls0 ws0">•总线兼容中断<span class="_ _1"> </span>(<span class="_ _1"> </span>/IRQ<span class="_ _1"> </span>)</div><div class="t m0 x4 h6 y12 ff3 fs3 fc0 sc0 ls0 ws0">•三种可编程中断</div><div class="t m0 x5 h6 y13 ff3 fs3 fc0 sc0 ls0 ws0">–<span class="_ _2"> </span>时间性中断<span class="_ _1"> </span>可产生每秒一次直到每天一次中断</div><div class="t m0 x5 h6 y14 ff3 fs3 fc0 sc0 ls0 ws0">–<span class="_ _2"> </span>周期性中断122<span class="_ _1"> </span>ms<span class="_ _3"> </span>到<span class="_ _1"> </span>500<span class="_ _1"> </span>ms</div><div class="t m0 x5 h6 y15 ff3 fs3 fc0 sc0 ls0 ws0">–<span class="_ _2"> </span>时钟更新结束中断</div><div class="t m0 x4 h5 y16 ff2 fs2 fc0 sc0 ls0 ws0">管脚名称</div><div class="t m0 x4 h6 y17 ff3 fs3 fc0 sc0 ls0 ws0">AD0–AD7<span class="_ _1"> </span>–<span class="_ _1"> </span>地址/<span class="_ _1"> </span>数据复用总线</div><div class="t m0 x4 h6 y18 ff3 fs3 fc0 sc0 ls0 ws0">NC<span class="_ _1"> </span>–<span class="_ _1"> </span>空脚</div><div class="t m0 x4 h6 y19 ff3 fs3 fc0 sc0 ls0 ws0">MOT<span class="_ _1"> </span>–<span class="_ _1"> </span>总线类型选择(<span class="_ _1"> </span>MOTOROLA/I<span class="_ _1"> </span>NTEL)</div><div class="t m0 x4 h6 y1a ff3 fs3 fc0 sc0 ls0 ws0">CS<span class="_ _2"> </span>–<span class="_ _1"> </span>片选</div><div class="t m0 x4 h6 y1b ff3 fs3 fc0 sc0 ls0 ws0">AS<span class="_ _1"> </span>–<span class="_ _1"> </span>ALE</div><div class="t m0 x4 h6 y1c ff3 fs3 fc0 sc0 ls0 ws0">R/W<span class="_ _2"> </span>–<span class="_ _1"> </span>在I<span class="_ _1"> </span>NTEL<span class="_ _0"></span>总线下作为<span class="_ _1"> </span>/<span class="_ _1"> </span>WR</div><div class="t m0 x4 h6 y1d ff3 fs3 fc0 sc0 ls0 ws0">DS<span class="_ _2"> </span>–在I<span class="_ _1"> </span>NTEL总线下作为<span class="_ _1"> </span>/<span class="_ _4"> </span>RD</div><div class="t m0 x4 h6 y1e ff3 fs3 fc0 sc0 ls0 ws0">RESET<span class="_ _2"> </span>–<span class="_ _1"> </span>复位信号</div><div class="t m0 x4 h6 y1f ff3 fs3 fc0 sc0 ls0 ws0">IRQ<span class="_ _2"> </span>–<span class="_ _1"> </span>中断请求输出</div><div class="t m0 x4 h6 y20 ff3 fs3 fc0 sc0 ls0 ws0">SQW<span class="_ _2"> </span>–<span class="_ _1"> </span>方波输出</div><div class="t m0 x4 h6 y21 ff3 fs3 fc0 sc0 ls0 ws0">VCC<span class="_ _1"> </span>–<span class="_ _1"> </span>+5<span class="_ _1"> </span>电源</div><div class="t m0 x4 h6 y22 ff3 fs3 fc0 sc0 ls0 ws0">GND<span class="_ _1"> </span>–<span class="_ _1"> </span>电源地</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>
2.DS12C887实时时钟