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本单片机教程是平凡老师花了大量时间

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      <FONT SIZE=2>P1</font><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>口锁存器</FONT><font size="2">
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>定时器</font><FONT SIZE=2>/</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>计数器</FONT><FONT SIZE=2>1</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>（高</FONT><FONT SIZE=2>8</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>位）</FONT><font size="2">
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>定时器</font><FONT SIZE=2>/</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>计数器</FONT><FONT SIZE=2>1</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>（低</FONT><FONT SIZE=2>8</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>位）</FONT><font size="2">
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>定时器</font><FONT SIZE=2>/</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>计数器</FONT><FONT SIZE=2>0</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>（高</FONT><FONT SIZE=2>8</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>位）</FONT><font size="2">
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>定时器</font><FONT SIZE=2>/</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>计数器</FONT><FONT SIZE=2>0</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>（低</FONT><FONT SIZE=2>8</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>位）</FONT><font size="2">
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>定时器</font><FONT SIZE=2>/</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>计数器方式控制寄存器</FONT><font size="2">
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>定时器</font><FONT SIZE=2>/</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>计数器控制寄存器</FONT><font size="2">
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      <P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">DPH 
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>数据地址指针（高</font><FONT SIZE=2>8</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>位）</FONT><font size="2">
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      <FONT FACE="宋体" LANG="ZH-CN" SIZE=2>数据地址指针（低</font><FONT SIZE=2>8</FONT><FONT FACE="宋体" LANG="ZH-CN" SIZE=2>位）</FONT><font size="2">
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      <P ALIGN="JUSTIFY" style="line-height: 150%; margin-top: 0; margin-bottom: 0">堆栈指针 
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