基于日历时钟12c887的自动结帐系统

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基于单片机日历时钟12c887的自动结帐系统 ,有程序。
12c887的自动结帐系统.rar
  • 基于日历时钟12c887的自动结帐系统
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内容介绍
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta charset="utf-8"> <meta name="generator" content="pdf2htmlEX"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <link rel="stylesheet" href="https://static.pudn.com/base/css/base.min.css"> <link rel="stylesheet" href="https://static.pudn.com/base/css/fancy.min.css"> <link rel="stylesheet" href="https://static.pudn.com/prod/directory_preview_static/630e407488df2007aaf8efc1/raw.css"> <script src="https://static.pudn.com/base/js/compatibility.min.js"></script> <script src="https://static.pudn.com/base/js/pdf2htmlEX.min.js"></script> <script> try{ pdf2htmlEX.defaultViewer = new pdf2htmlEX.Viewer({}); }catch(e){} </script> <title></title> </head> <body> <div id="sidebar" style="display: none"> <div id="outline"> </div> </div> <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/630e407488df2007aaf8efc1/bg1.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">DS12C887</div><div class="t m0 x2 h3 y2 ff2 fs0 fc0 sc0 ls0 ws1">Real T<span class="_ _0"></span>ime Clock</div><div class="t m0 x3 h4 y3 ff2 fs1 fc0 sc0 ls0 ws2">DS12C887</div><div class="t m0 x4 h5 y4 ff1 fs2 fc1 sc0 ls0 ws3">PRELIMINAR<span class="_ _0"></span>Y</div><div class="t m0 x5 h4 y5 ff2 fs1 fc0 sc0 ls0 ws4">012899 1/17</div><div class="t m0 x6 h5 y6 ff1 fs2 fc0 sc0 ls0 ws5">FEA<span class="_ _0"></span>TURES</div><div class="t m0 x6 h6 y7 ff3 fs3 fc0 sc0 ls0 ws6">&#8226;<span class="_"> </span><span class="ff2 fs4 ws7">Drop&#8211;in replacement for IBM A<span class="_ _0"></span>T computer clock/</span></div><div class="t m0 x7 h7 y8 ff2 fs4 fc0 sc0 ls0 ws7">calendar</div><div class="t m0 x6 h6 y9 ff3 fs3 fc0 sc0 ls0 ws8">&#8226;<span class="_ _1"> </span><span class="ff2 fs4 ws9">Pin compatible with the MC146818B and DS1287</span></div><div class="t m0 x6 h6 ya ff3 fs3 fc0 sc0 ls0 wsa">&#8226;<span class="_ _1"> </span><span class="ff2 fs4 wsb">T<span class="_ _2"></span>otally nonvolatile with over 10 years of operation in</span></div><div class="t m0 x7 h7 yb ff2 fs4 fc0 sc0 ls0 wsc">the absence of power</div><div class="t m0 x6 h6 yc ff3 fs3 fc0 sc0 ls0 wsd">&#8226;<span class="_"> </span><span class="ff2 fs4 wse">Self&#8211;contained subsystem includes lithium, quartz,</span></div><div class="t m0 x7 h7 yd ff2 fs4 fc0 sc0 ls0 wsf">and support circuitry</div><div class="t m0 x6 h6 ye ff3 fs3 fc0 sc0 ls0 ws10">&#8226;<span class="_"> </span><span class="ff2 fs4 ws11">Counts seconds, minutes, hours, days, day of the</span></div><div class="t m0 x7 h7 yf ff2 fs4 fc0 sc0 ls0 ws12">week, date, month, and year with leap year com-</div><div class="t m0 x7 h7 y10 ff2 fs4 fc0 sc0 ls0 ws13">pensation valid up to 2100</div><div class="t m0 x6 h6 y11 ff3 fs3 fc0 sc0 ls0 ws14">&#8226;<span class="_"> </span><span class="ff2 fs4 wsb">Binary or BCD representation of time, calendar<span class="_ _0"></span>, and</span></div><div class="t m0 x7 h7 y12 ff2 fs4 fc0 sc0 ls0 wsb">alarm</div><div class="t m0 x6 h6 y13 ff3 fs3 fc0 sc0 ls0 ws15">&#8226;<span class="_"> </span><span class="ff2 fs4 ws16">12&#8211; or 24&#8211;hour clock with AM and PM in 12&#8211;hour</span></div><div class="t m0 x7 h7 y14 ff2 fs4 fc0 sc0 ls0 ws16">mode</div><div class="t m0 x6 h6 y15 ff3 fs3 fc0 sc0 ls0 ws17">&#8226;<span class="_ _1"> </span><span class="ff2 fs4 ws18">Daylight Savings T<span class="_ _0"></span>ime option</span></div><div class="t m0 x6 h6 y16 ff3 fs3 fc0 sc0 ls0 ws19">&#8226;<span class="_"> </span><span class="ff2 fs4 ws1a">Selectable between Motorola a<span class="fc2 sc0">nd Intel bus timing</span></span></div><div class="t m0 x6 h6 y17 ff3 fs3 fc0 sc0 ls0 ws1b">&#8226;<span class="_ _1"> </span><span class="ff2 fs4 ws1c">Multiplex bus for pin efficiency</span></div><div class="t m0 x6 h6 y18 ff3 fs3 fc0 sc0 ls0 ws1d">&#8226;<span class="_"> </span><span class="ff2 fs4 ws1c">Interfaced with software as 12<span class="fc2 sc0">8 RAM locations</span></span></div><div class="t m0 x8 h7 y19 ff2 fs4 fc0 sc0 ls0 ws1e">&#8211;<span class="_ _3"> </span>15 bytes of clock and control registers</div><div class="t m0 x8 h7 y1a ff2 fs4 fc0 sc0 ls0 ws1f">&#8211;<span class="_ _3"> </span>1<span class="_ _0"></span>13 bytes of general purpose RAM</div><div class="t m0 x6 h6 y1b ff3 fs3 fc0 sc0 ls0 ws20">&#8226;<span class="_"> </span><span class="ff2 fs4 ws21">Programmable square wave output signal</span></div><div class="t m0 x6 h6 y1c ff3 fs3 fc0 sc0 ls0 ws22">&#8226;<span class="_ _1"> </span><span class="ff2 fs4 ws21">Bus&#8211;compatible interrupt signals (IRQ)</span></div><div class="t m0 x6 h6 y1d ff3 fs3 fc0 sc0 ls0 ws22">&#8226;<span class="_ _1"> </span><span class="ff2 fs4 ws23">Three interrupts are separately software&#8211;maskable</span></div><div class="t m0 x7 h7 y1e ff2 fs4 fc0 sc0 ls0 ws24">and testable</div><div class="t m0 x8 h7 y1f ff2 fs4 fc0 sc0 ls0 ws21">&#8211;<span class="_ _3"> </span>T<span class="_ _0"></span>ime&#8211;of&#8211;day alarm once/second to once/day</div><div class="t m0 x8 h8 y20 ff2 fs4 fc0 sc0 ls0 ws13">&#8211;<span class="_ _3"> </span>Periodic rates from 122 <span class="ff4">&#181;</span><span class="ws18">s to 500 ms</span></div><div class="t m0 x8 h7 y21 ff2 fs4 fc0 sc0 ls0 wsf">&#8211;<span class="_ _3"> </span>End of clock update cycle</div><div class="t m0 x6 h6 y22 ff3 fs3 fc0 sc0 ls0 ws10">&#8226;<span class="_"> </span><span class="ff2 fs4 ws21">Century register</span></div><div class="t m0 x9 h5 y6 ff1 fs2 fc0 sc0 ls0 ws25">PIN ASSIGNMENT</div><div class="t m0 xa h4 y23 ff2 fs1 fc0 sc0 ls0 ws26"><span class="fc2 sc0">24 PIN ENCAPSULA</span><span class="_ _0"></span><span class="fc2 sc0">TED</span> P<span class="_ _0"></span>ACKAGE</div><div class="t m0 xb h4 y24 ff2 fs1 fc0 sc0 ls0 ws26">V</div><div class="t m0 xc h9 y25 ff2 fs5 fc0 sc0 ls1 ws27">CC</div><div class="t m0 xb h4 y26 ff2 fs1 fc0 sc0 ls0 ws26">SQW</div><div class="t m0 xb h4 y27 ff2 fs1 fc0 sc0 ls0 ws26">NC</div><div class="t m0 xb h4 y28 ff2 fs1 fc0 sc0 ls0 ws26">NC</div><div class="t m0 xb h4 y29 ff2 fs1 fc0 sc0 ls0 ws26">NC</div><div class="t m0 xb h4 y2a ff2 fs1 fc0 sc0 ls0 ws26">IRQ</div><div class="t m0 xb h4 y2b ff2 fs1 fc0 sc0 ls0 ws26">RESET</div><div class="t m0 xb h4 y2c ff2 fs1 fc0 sc0 ls0 ws26">DS</div><div class="t m0 xb h4 y2d ff2 fs1 fc0 sc0 ls0 ws26">NC</div><div class="t m0 xb h4 y2e ff2 fs1 fc0 sc0 ls0 ws26">R/W</div><div class="t m0 xb h4 y2f ff2 fs1 fc0 sc0 ls0 ws26">AS</div><div class="t m0 xb h4 y30 ff2 fs1 fc0 sc0 ls0 ws26">CS</div><div class="t m0 xd h4 y31 ff2 fs1 fc0 sc0 ls0 ws26">MOT</div><div class="t m0 xe h4 y32 ff2 fs1 fc0 sc0 ls0 ws26">NC</div><div class="t m0 xe h4 y33 ff2 fs1 fc0 sc0 ls0 ws26">NC</div><div class="t m0 xf h4 y34 ff2 fs1 fc0 sc0 ls0 ws26">AD0</div><div class="t m0 xf h4 y35 ff2 fs1 fc0 sc0 ls0 ws26">AD1</div><div class="t m0 xf h4 y36 ff2 fs1 fc0 sc0 ls0 ws26">AD2</div><div class="t m0 xf h4 y37 ff2 fs1 fc0 sc0 ls0 ws26">AD3</div><div class="t m0 xf h4 y38 ff2 fs1 fc0 sc0 ls0 ws26">AD4</div><div class="t m0 xf h4 y39 ff2 fs1 fc0 sc0 ls0 ws26">AD5</div><div class="t m0 xf h4 y3a ff2 fs1 fc0 sc0 ls0 ws26">AD6</div><div class="t m0 xf h4 y3b ff2 fs1 fc0 sc0 ls0 ws26">AD7</div><div class="t m0 xd h4 y3c ff2 fs1 fc0 sc0 ls0 ws26">GND</div><div class="t m0 x10 h4 y31 ff2 fs1 fc0 sc0 ls0 ws26">1</div><div class="t m0 x10 h4 y32 ff2 fs1 fc0 sc0 ls0 ws26">2</div><div class="t m0 x10 h4 y33 ff2 fs1 fc0 sc0 ls0 ws26">3</div><div class="t m0 x10 h4 y34 ff2 fs1 fc0 sc0 ls0 ws26">4</div><div class="t m0 x10 h4 y35 ff2 fs1 fc0 sc0 ls0 ws26">5</div><div class="t m0 x10 h4 y36 ff2 fs1 fc0 sc0 ls0 ws26">6</div><div class="t m0 x10 h4 y37 ff2 fs1 fc0 sc0 ls0 ws26">7</div><div class="t m0 x10 h4 y38 ff2 fs1 fc0 sc0 ls0 ws26">8</div><div class="t m0 x10 h4 y39 ff2 fs1 fc0 sc0 ls0 ws26">9</div><div class="t m0 x10 h4 y3a ff2 fs1 fc0 sc0 ls0 ws26">10</div><div class="t m0 x10 h4 y3b ff2 fs1 fc0 sc0 ls2 ws26">11</div><div class="t m0 x10 h4 y3c ff2 fs1 fc0 sc0 ls0 ws26">12</div><div class="t m0 x11 h4 y31 ff2 fs1 fc0 sc0 ls0 ws26">24</div><div class="t m0 x11 h4 y32 ff2 fs1 fc0 sc0 ls0 ws26">23</div><div class="t m0 x11 h4 y33 ff2 fs1 fc0 sc0 ls0 ws26">22</div><div class="t m0 x11 h4 y34 ff2 fs1 fc0 sc0 ls0 ws26">21</div><div class="t m0 x11 h4 y35 ff2 fs1 fc0 sc0 ls0 ws26">20</div><div class="t m0 x11 h4 y36 ff2 fs1 fc0 sc0 ls0 ws26">19</div><div class="t m0 x11 h4 y37 ff2 fs1 fc0 sc0 ls0 ws26">18</div><div class="t m0 x11 h4 y38 ff2 fs1 fc0 sc0 ls0 ws26">17</div><div class="t m0 x11 h4 y39 ff2 fs1 fc0 sc0 ls0 ws26">16</div><div class="t m0 x11 h4 y3a ff2 fs1 fc0 sc0 ls0 ws26">15</div><div class="t m0 x11 h4 y3b ff2 fs1 fc0 sc0 ls0 ws26">14</div><div class="t m0 x11 h4 y3c ff2 fs1 fc0 sc0 ls0 ws26">13</div><div class="t m0 x9 h5 y3d ff1 fs2 fc0 sc0 ls0 ws28"><span class="fc2 sc0">PIN DESCRIPTION</span></div><div class="t m0 x9 h7 y3e ff2 fs4 fc0 sc0 ls0 wsc"><span class="fc2 sc0">AD0&#8211;AD7</span><span class="_ _4"> </span><span class="fc2 sc0">&#8211;</span><span class="_ _3"> </span><span class="fc2 sc0">Multiplexed</span><span class="_ _0"></span><span class="fc2 sc0"> </span>Address/Data Bus</div><div class="t m0 x9 h7 y3f ff2 fs4 fc0 sc0 ls0 ws29"><span class="fc2 sc0">NC</span><span class="_ _5"> </span><span class="fc2 sc0">&#8211;</span><span class="_ _3"> </span><span class="fc2 sc0">No Connect</span>ion</div><div class="t m0 x9 h7 y40 ff2 fs4 fc0 sc0 ls0 ws2a"><span class="fc2 sc0">MOT</span><span class="_ _6"> </span><span class="fc2 sc0">&#8211;</span><span class="_ _3"> </span><span class="fc2 sc0">Bus T</span><span class="_ _0"></span><span class="fc2 sc0">ype </span><span class="fc2 sc0">S</span>election</div><div class="t m0 x9 h7 y41 ff2 fs4 fc0 sc0 ls0 ws2a">CS</div><div class="t m0 x12 h7 y42 ff2 fs4 fc0 sc0 ls0 ws1a">&#8211;<span class="_ _3"> </span>Chip Select</div><div class="t m0 x9 h7 y43 ff2 fs4 fc0 sc0 ls0 ws1a">AS<span class="_ _7"> </span>&#8211;<span class="_ _3"> </span>Address Strobe</div><div class="t m0 x9 h7 y44 ff2 fs4 fc0 sc0 ls0 ws1a">R/W</div><div class="t m0 x12 h7 y45 ff2 fs4 fc0 sc0 ls0 ws2b">&#8211;<span class="_ _3"> </span>Read/W<span class="_ _0"></span>rite Input</div><div class="t m0 x9 h7 y46 ff2 fs4 fc0 sc0 ls0 ws2c">DS<span class="_ _8"> </span>&#8211;<span class="_ _3"> </span>Data Strobe</div><div class="t m0 x9 h7 y47 ff2 fs4 fc0 sc0 ls0 ws2c">RESET</div><div class="t m0 x12 h7 y48 ff2 fs4 fc0 sc0 ls0 ws21">&#8211;<span class="_ _3"> </span>Reset Input</div><div class="t m0 x9 h7 y49 ff2 fs4 fc0 sc0 ls0 ws21">IRQ</div><div class="t m0 x12 h7 y4a ff2 fs4 fc0 sc0 ls0 ws2b">&#8211;<span class="_ _3"> </span>Interrupt Request Output</div><div class="t m0 x9 h7 y4b ff2 fs4 fc0 sc0 ls0 ws24">SQW<span class="_ _9"> </span>&#8211;<span class="_ _3"> </span>Square W<span class="_ _0"></span>ave Output</div><div class="t m0 x9 h7 y4c ff2 fs4 fc0 sc0 ls0 ws24">V</div><div class="t m0 x13 ha y4d ff2 fs6 fc0 sc0 ls3 ws2d">CC</div><div class="t m0 x12 h7 y4e ff2 fs4 fc0 sc0 ls0 wsc">&#8211;<span class="_ _3"> </span>+5 V<span class="_ _0"></span>olt Supply</div><div class="t m0 x9 h7 y4f ff2 fs4 fc0 sc0 ls0 wsc">GND<span class="_ _6"> </span>&#8211;<span class="_ _3"> </span>Ground</div><div class="t m0 x6 h5 y50 ff1 fs2 fc0 sc0 ls0 ws2e">DESCRIPTION</div><div class="t m0 x6 h7 y51 ff2 fs4 fc0 sc0 ls0 ws2f">The DS12C887 Real T<span class="_ _0"></span>ime Clock plus RAM is designed</div><div class="t m0 x6 h7 y52 ff2 fs4 fc0 sc0 ls0 ws30">as a direct upgrade replacement for the DS12887 in</div><div class="t m0 x6 h7 y53 ff2 fs4 fc0 sc0 ls0 ws31">existing IBM compatible personal computers to add</div><div class="t m0 x6 h7 y54 ff2 fs4 fc0 sc0 ls0 ws32">hardware year 2000 compliance. A century byte was</div><div class="t m0 x6 h7 y55 ff2 fs4 fc0 sc0 ls0 ws33">added to memory location 50, 32h, as called out by the</div><div class="t m0 x6 h7 y56 ff2 fs4 fc0 sc0 ls0 ws34">PC A<span class="_ _0"></span>T specification. A lithium energy source, quartz</div><div class="t m0 x6 h7 y57 ff2 fs4 fc0 sc0 ls0 ws35">crystal, and write&#8211;protection circuitry are contained</div><div class="t m0 x6 h7 y58 ff2 fs4 fc0 sc0 ls0 ws36">within a 24&#8211;pin dual in-line package. As such, the</div><div class="t m0 x9 h7 y51 ff2 fs4 fc0 sc0 ls0 ws37">DS12C887 is a complete subsystem replacing 16 com-</div><div class="t m0 x9 h7 y59 ff2 fs4 fc0 sc0 ls0 ws38">ponents in a typical application. The functions include a</div><div class="t m0 x9 h7 y5a ff2 fs4 fc0 sc0 ls0 ws39">nonvolatile time&#8211;of&#8211;day clock, an alarm, a <span class="_ _0"></span>one-</div><div class="t m0 x9 h7 y5b ff2 fs4 fc0 sc0 ls0 ws3a">hundred&#8211;year calendar<span class="_ _0"></span>, programmable interrupt,</div><div class="t m0 x9 h7 y55 ff2 fs4 fc0 sc0 ls0 ws3b">square wave generator<span class="_ _0"></span>, and 1<span class="_ _0"></span>13 bytes of nonvolatile</div><div class="t m0 x9 h7 y56 ff2 fs4 fc0 sc0 ls0 ws3c">static RAM. The real time clock is distinctive in that</div><div class="t m0 x9 h7 y57 ff2 fs4 fc0 sc0 ls0 ws3d">time&#8211;of&#8211;day and memory are maintained even in the</div><div class="t m0 x9 h7 y58 ff2 fs4 fc0 sc0 ls0 ws1e">absence of power<span class="_ _0"></span>.</div></div><div class="pi" data-data='{"ctm":[1.479199,0.000000,0.000000,1.479199,0.000000,0.000000]}'></div></div> </body> </html>
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