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<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<project id="c7548116-e38e-4b19-a8bb-4e987e52bffb" name="8253" version="1">
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<file relativepath="rw.dlsche"/>
<file relativepath="f0.dlsche"/>
<file relativepath="f1.dlsche"/>
<file relativepath="f2.dlsche"/>
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<file relativepath="f4.dlsche"/>
<file relativepath="f5.dlsche"/>
<file relativepath="rc.dlsche"/>
</filefolder>
<file relativepath="8253.dlsche"/>
<file relativepath="README.md"/>
<file relativepath="8254.pdf"/>
</files>
</project>
8253.dlsche 0 → 100644
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="90" font-weight="400" text-anchor="start" x="1919" y="1336">计数器0</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="90" font-weight="400" text-anchor="start" x="1939" y="2436">计数器1</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="90" font-weight="400" text-anchor="start" x="1929" y="3556">计数器2</text>
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# 说明
Intel 8253 可编程定时计数器
# Datasheet
[8253.pdf](8254.pdf)
# 原理图
![raw svg](8253.dlsche.svg)
\ No newline at end of file
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="101" y="654">⑥GATE=0，停止计数</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="2011" y="894">计数使能，低电平有效</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="微软雅黑" font-size="250" font-weight="700" text-anchor="start" x="161" y="314">计数方式0：定时中断触发器</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="121" y="2394">①写方式控制字后输出低电平</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1999" y="2202">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2022" y="2397">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1998" y="2457">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2065" y="2261">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2109" y="2264">5</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="2021" y="1214">计数器异步置数信号，低电平有效</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="995" y="2161">D</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="939" y="2163">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1009" y="2264">CLK</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1088" y="2369">D_FLOP</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="21" y="1714">④写入计数初值后下个上升沿加载16位计数初值</text>
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<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="37" font-weight="400" text-anchor="start" x="3421" y="864">（1）：软件启动，不能自动重复</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="37" font-weight="400" text-anchor="start" x="3421" y="964">（2）：写入控制字CW后，输出端OUT变低</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="37" font-weight="400" text-anchor="start" x="3421" y="1064">（3）：写入高字节计数值后，下个时钟上升沿，初值加载到计数器</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="37" font-weight="400" text-anchor="start" x="3421" y="1164">（4）：计数器减到0后，OUT端变为高电平，计数停止</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="37" font-weight="400" text-anchor="start" x="3421" y="1264">（5）：GATE=1，允许计数，0，停止计数，保持计数值不变</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1095" y="1361">D</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1039" y="1363">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1109" y="1464">CLK</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1195" y="1361">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1239" y="1364">5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1179" y="1463">^Q</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1179" y="1063">^Q</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="681" y="960">NOT</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="271" y="834">②写入低字节后，停止计数</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="31" y="1414">③写入高字节后，输出门控信号GATE控制计数</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="521" y="1794">CLK</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="521" y="2264">CLK</text>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="1321" y="2164">ZERO</text>
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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="771" y="804">ZERO</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="751" y="744">⑤计数减到零，停止计数</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="37" font-weight="400" text-anchor="start" x="3421" y="1364">（6）：计数减到零，停止计数</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="37" font-weight="400" text-anchor="start" x="3421" y="1464">（7）：写入高字节后，输出变为低电平</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1341" y="2354">③写入高字节后，输出低电平</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1471" y="2154">⑤计数减为零输出高电平</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1826" y="877">U11</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2295" y="1361">D</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2239" y="1363">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2309" y="1464">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2239" y="1462">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2351" y="1337">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2329" y="1302">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2352" y="1497">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2328" y="1557">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2395" y="1361">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2439" y="1364">5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2379" y="1463">^Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2430" y="1464">4</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2426" y="1306">U12</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2388" y="1569">D_FLOP</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1681" y="1890">NOT</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1921" y="1864">⑥在异步置数完成后的时钟下降沿，清除置数信号，下个上升沿到来时减1</text>
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f1.dlsche 0 → 100644
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f1.dlsche.svg 0 → 100644
浏览文件 @ d031df65
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<text alignment-baseline="after-edge" fill="#000000" font-family="微软雅黑" font-size="250" font-weight="700" text-anchor="start" x="441" y="315">计数方式1：可编程单稳态触发器</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="181" y="635">①写方式控制字后输出高电平</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1381" y="1585">CONSTANT1</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3721" y="885">输出</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="2941" y="1465">①门控信号GATE上升沿到来后的第一个时钟上升沿计数器重新加载初值</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1241" y="915">③计数减到0时输出高电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="2441" y="2525">②写入方式控制字后停止计数，GATE上升沿到来后计数开始</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1891" y="1055">④GATE上升沿到来后的第一个时钟上升沿使得OUT输出低电平</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="922" y="968">CLR</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="965" y="832">Q</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="949" y="934">^Q</text>
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<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="3121" y="785">OUTPUT</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2702" y="1818">CLR</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2745" y="1682">Q</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2738" y="1890">D_FLOP</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="40" font-weight="400" text-anchor="start" x="4421" y="685">（1）方式1是一种硬件启动，不能自动重复的计数方式</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="40" font-weight="400" text-anchor="start" x="4421" y="785">（2）：写入方式控制字后，OUT端变为高电平</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="40" font-weight="400" text-anchor="start" x="4421" y="885">（3）：计数初值写入计数器后，要等GATE信号出现正跳变（上升沿）才启动减计数，计数启动后，OUT端立即变为低电平</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="40" font-weight="400" text-anchor="start" x="4421" y="985">（4）：计数器减到零时，OUT端输出高电平</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="40" font-weight="400" text-anchor="start" x="4421" y="1085">（5）：在计数过程启动后而完成之前，若GATE有发生正跳变，则计数器过程又从初值启动，OUT端的低电平不变，两次计数过程合在一起，OUT输出的负脉冲加宽了，</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="40" font-weight="400" text-anchor="start" x="4421" y="1185">（6）：计数过程中若写入新的计数初值，并不会立即加载到计数器中。而要等待下一个GATE的启动信号，计数器才开始加载新的初值并开始计数。</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1659" y="1785">CLK</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1701" y="1658">PR</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1745" y="1682">Q</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1729" y="1784">^Q</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2145" y="1682">D</text>
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f2.dlsche 0 → 100644
浏览文件 @ d031df65
添加文件
f2.dlsche.svg 0 → 100644
浏览文件 @ d031df65
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1640" y="2554">④计数到0时重新置数</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1650" y="2964">③计数到1时输出低电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1650" y="2464">④计数到0时输出高电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3990" y="1364">（1）：方式2计数既可以用软件启动，也可以用硬件启动。启动后，计数器可以自动重复工作。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3990" y="1464">（2）：GATE=1时，写入计数初值后自动启动计数。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3990" y="1564">（3）：GATE由低变高，重新加载初值并启动计数</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3990" y="1754">（5）：写入方式控制字后，OUT变高。计数器减到1时，OUT变低。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3990" y="1854">（6）：计数器减到零时，OUT变为高电平。且重新加载初值，开始新一轮的计数过程。</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3990" y="1954">（7）：计数过程中写入新的计数初值后，加载新的初值。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3990" y="1664">（4）：GATE=0，计数器停止计数</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2565" y="2257">AND3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="834" y="1761">D</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="778" y="1763">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="848" y="1864">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="778" y="1862">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="890" y="1737">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="868" y="1702">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="891" y="1897">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="867" y="1957">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="934" y="1761">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="978" y="1764">5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="918" y="1863">^Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="969" y="1864">4</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="927" y="1969">D_FLOP</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1530" y="1544">②写入高字节初值后的第一个时钟上升沿加载初值</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1258" y="1763">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1328" y="1864">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1258" y="1862">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1370" y="1737">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1348" y="1702">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1371" y="1897">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1347" y="1957">3</text>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1440" x2="1490" y1="1764" y2="1764"/>
<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1414" y="1761">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1458" y="1764">5</text>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="1440" x2="1490" y1="1864" y2="1864"/>
<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1398" y="1863">^Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1449" y="1864">4</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1445" y="1706">U8</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1407" y="1969">D_FLOP</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1814" y="1761">D</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1758" y="1763">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1828" y="1864">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1758" y="1862">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1870" y="1737">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1848" y="1702">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1871" y="1897">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1847" y="1957">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1914" y="1761">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1958" y="1764">5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1898" y="1863">^Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1949" y="1864">4</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1945" y="1706">U18</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1907" y="1969">D_FLOP</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1350" y="2260">NOT</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2250" y="1410">NOT</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="2800" y="914">⑧加载初值后的第一个时钟的下降沿清除LOAD信号，为计数做准备</text>
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<circle cx="2040" cy="924" fill="#0000ff" r="8" stroke="#0000ff" stroke-width="5"/>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="2820" y="534">计数使能，低电平有效</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="微软雅黑" font-size="250" font-weight="700" text-anchor="start" x="580" y="314">计数方式3：方波发生器</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="2850" y="1884">计数器置数信号，低电平有效</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="860" y="574">GATE=1，允许计数</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="140" y="3354">①写入方式控制字后，输出立即变高电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="140" y="1044">⑤GATE上升沿后的第一个时钟上升沿计数器重新加载初始值</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="20" y="1834">②写入初值高字节后的第一个时钟上升沿重新加载计数初值</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1400" y="2404">④计数减0时重新加载计数初值，开始新一轮的计数</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1410" y="2304">④计数减到0时输出变高</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1370" y="2684">③计数减到一半时输出变低</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="874">（1）：方式3有2种启动方式，计数能自动重复，其OUT端的输出波形是方波</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="974">（2）：写入方式3的控制字后，计数器OUT端立即变为高电平。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="1074">（3）：若GATE信号为高，在写完计数初值N后开始减计数。计到N/2时，OUT端变低，计完余下的N/2，OUT又变为高电平，如此自动重复，OUT端产生周期为NxTclk的方波。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="1174">（4）：若计数初值为奇数，计数的前半周期为（N+1）/2，后半周期为（N-1）/2。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="1274">（5）：GATE=0，停止计数，输出立即变高。</text>
<text alignment-baseline="after-edge" fill="#ff0000" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3610" y="1484">（7）：写入高字节初值后的第一个时钟上升沿加载初值开始计数</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1517" y="3469">D_FLOP</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1424" y="861">D</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1438" y="964">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1368" y="962">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1480" y="837">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1458" y="802">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1481" y="997">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1457" y="1057">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1524" y="861">Q</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1517" y="1069">D_FLOP</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1924" y="861">D</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1938" y="964">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1868" y="962">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="1980" y="837">PR</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2024" y="861">Q</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2017" y="1069">D_FLOP</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2424" y="861">D</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2438" y="964">CLK</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2480" y="837">PR</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="middle" x="2524" y="861">Q</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2517" y="1069">D_FLOP</text>
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f4.dlsche 0 → 100644
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f4.dlsche.svg 0 → 100644
浏览文件 @ d031df65
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="665">（1）：写入方式控制字后，OUT输出高电平</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="765">（2）：写完计数初值后的第一个时钟上升沿将初值置入计数器，准备计数</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="865">（3）：GATE=0，停止计数，GATE=1，允许计数</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1545" y="915">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1603" y="1015">R</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1637" y="883">PR</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1669" y="1049">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1645" y="1105">4</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1687" y="915">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1745" y="915">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1674" y="1011">^Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1745" y="1015">5</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1700" y="855">U9</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="1690" y="1115">SR_FLOP</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2103" y="915">S</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2045" y="915">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2103" y="1015">R</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2045" y="1015">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2130" y="963">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2045" y="965">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2137" y="883">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2129" y="855">7</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2169" y="1049">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2145" y="1105">4</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2187" y="915">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2245" y="915">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2174" y="1011">^Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2245" y="1015">5</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2200" y="855">U10</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2190" y="1115">SR_FLOP</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2703" y="915">S</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2645" y="915">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2703" y="1015">R</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2645" y="1015">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2730" y="963">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2645" y="965">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2737" y="883">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2729" y="855">7</text>
<line stroke="#000000" stroke-linecap="round" stroke-width="5" x1="2750" x2="2750" y1="1065" y2="1115"/>
<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2769" y="1049">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="2745" y="1105">4</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2787" y="915">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2845" y="915">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2774" y="1011">^Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="2845" y="1015">5</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2800" y="855">U11</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="2790" y="1115">SR_FLOP</text>
<polyline fill="none" points="2370 915, 2520 915, 2520 965, 2620 965" stroke="#0000ff" stroke-linecap="round" stroke-linejoin="round" stroke-width="5"/>
<text alignment-baseline="after-edge" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="2620" y="915">H</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="965">（4）：计数减为1时，输出低电平，计数减为0时，输出高电平</text>
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<text alignment-baseline="central" fill="#800000" font-family="Times New Roman" font-size="25" font-weight="400" text-anchor="start" x="20" y="2465">ZF</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="703" y="1915">S</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="645" y="1915">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="703" y="2015">R</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="645" y="2015">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="730" y="1963">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="645" y="1965">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="737" y="1883">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="729" y="1855">7</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="769" y="2049">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="745" y="2105">4</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="787" y="1915">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="845" y="1915">6</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="774" y="2011">^Q</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="800" y="1855">U2</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="790" y="2115">SR_FLOP</text>
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<text alignment-baseline="after-edge" fill="#000000" font-family="Arial" font-size="25" font-weight="700" text-anchor="start" x="630" y="2079">U5</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1203" y="1915">S</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1145" y="1915">1</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1203" y="2015">R</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1145" y="2015">3</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1230" y="1963">CLK</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1145" y="1965">2</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1237" y="1883">PR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1229" y="1855">7</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1269" y="2049">CLR</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="end" x="1245" y="2105">4</text>
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<text alignment-baseline="central" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1287" y="1915">Q</text>
<text alignment-baseline="after-edge" fill="#000000" font-family="Courier New" font-size="17" font-weight="400" text-anchor="start" x="1345" y="1915">6</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1710" y="1905">③计数减为1，输出低电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1660" y="2465">④计数减为0，输出高电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="220" y="945">②写入计数初值的高字节后的第一个时钟上升沿重新加载计数初值</text>
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f5.dlsche 0 → 100644
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f5.dlsche.svg 0 → 100644
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="665">（1）：方式5是硬件启动计数，不自动重复的计数方式。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="765">（2）：写入方式控制字后，输出变为高电平。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="865">（3）：GATE信号出现正向跳变的上升沿的下一个时钟上升沿重新加载初值并开始计数。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="3620" y="965">（4）：计数减到零时，输出变为低电平。</text>
<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1730" y="2255">②计数减到零时输出低电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1750" y="2765">③计数减到-1时，输出高电平</text>
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<text alignment-baseline="after-edge" fill="#000080" font-family="宋体" font-size="25" font-weight="400" text-anchor="start" x="1260" y="1475">⑤写入工作方式字或者计数减到-1时，停止计数</text>
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