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原创 S3C2440的定时器设置

 2010-4-22 15:55  3268 22 22 分类: MCU/ 嵌入式

<p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">S<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />3C2440</span><span style="font-family:'宋体';">有</span><span lang="en-us" xml:lang="en-us">5</span><span style="font-family:'宋体';">个</span><span lang="en-us" xml:lang="en-us">16</span><span style="font-family:'宋体';">位定时器，定时器</span><span lang="en-us" xml:lang="en-us">0-3</span><span style="font-family:'宋体';">有</span><span lang="en-us" xml:lang="en-us">PWM</span><span style="font-family:'宋体';">功能，定时器</span><span lang="en-us" xml:lang="en-us">4</span><span style="font-family:'宋体';">有一个没有输出引脚的内部定时器，定时器</span><span lang="en-us" xml:lang="en-us">0</span><span style="font-family:'宋体';">有一个用于大电流设备的死区生成器。</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /></span></p><p> </p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-family:'宋体';">有</span><span lang="en-us" xml:lang="en-us">2</span><span style="font-family:'宋体';">个</span><span lang="en-us" xml:lang="en-us">8</span><span style="font-family:'宋体';">位预分频器和</span><span lang="en-us" xml:lang="en-us">2</span><span style="font-family:'宋体';">个</span><span lang="en-us" xml:lang="en-us">4</span><span style="font-family:'宋体';">位分频器。定时器</span><span lang="en-us" xml:lang="en-us">0</span><span style="font-family:'宋体';">和定时器</span><span lang="en-us" xml:lang="en-us">1</span><span style="font-family:'宋体';">共用一个</span><span lang="en-us" xml:lang="en-us">8</span><span style="font-family:'宋体';">位预分频器。定时器</span><span lang="en-us" xml:lang="en-us">2</span><span style="font-family:'宋体';">，定时器</span><span lang="en-us" xml:lang="en-us">3</span><span style="font-family:'宋体';">，定时器</span><span lang="en-us" xml:lang="en-us">4</span><span style="font-family:'宋体';">共用另一个</span><span lang="en-us" xml:lang="en-us">8</span><span style="font-family:'宋体';">位预分频器。</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-family:'宋体';">定时器的时钟源是</span><span lang="en-us" xml:lang="en-us">PCLK</span><span style="font-family:'宋体';">，首先经过预分频器降低频率后，进入第二个分频，可以生成</span><span lang="en-us" xml:lang="en-us">5</span><span style="font-family:'宋体';">种不同的分频信号（</span><span lang="en-us" xml:lang="en-us">1/2,1/4,1/8,1/16</span><span style="font-family:'宋体';">和</span><span lang="en-us" xml:lang="en-us">TCLK</span><span style="font-family:'宋体';">）。其中</span><span lang="en-us" xml:lang="en-us">TCLK0</span><span style="font-family:'宋体';">，</span><span lang="en-us" xml:lang="en-us">TCLK1</span><span style="font-family:'宋体';">是</span><span lang="en-us" xml:lang="en-us">S3C2440</span><span style="font-family:'宋体';">的外部时钟信号输入管脚。</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us"></span></p><p> </p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-family:'宋体';">所有定时器都是递减计数。</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-family:'宋体';">预分频器值（</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">prescaler value</span><span style="font-size:10pt;font-family:'宋体';">）</span><span style="font-family:'宋体';">在</span><span lang="en-us" xml:lang="en-us">TCFG0(0X5100 0000)</span><span style="font-family:'宋体';">中设置</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">0-7</span><span style="font-family:'宋体';">位设置</span><span lang="en-us" xml:lang="en-us">TIMER0,TIMER1</span><span style="font-family:'宋体';">的预分频值。</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">8-15</span><span style="font-family:'宋体';">位设置</span><span lang="en-us" xml:lang="en-us">TIMER2,3,4</span><span style="font-family:'宋体';">的预分频值。</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-family:'宋体';">第二个分频器的值（</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">divider value</span><span style="font-size:10pt;font-family:'宋体';">）</span><span style="font-family:'宋体';">在</span><span lang="en-us" xml:lang="en-us">TCFG1</span><span style="font-family:'宋体';">（</span><span lang="en-us" xml:lang="en-us">0X5100 0004</span><span style="font-family:'宋体';">）中设置</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">0-3</span><span style="font-family:'宋体';">位设置</span><span lang="en-us" xml:lang="en-us">TIMER0</span><span style="font-family:'宋体';">的分频值</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">4-7</span><span style="font-family:'宋体';">位设置</span><span lang="en-us" xml:lang="en-us">TIMER1</span><span style="font-family:'宋体';">的分频值</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">8-11</span><span style="font-family:'宋体';">位设置</span><span lang="en-us" xml:lang="en-us">TIMER2</span><span style="font-family:'宋体';">的分频值</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">12-15</span><span style="font-family:'宋体';">位设置</span><span lang="en-us" xml:lang="en-us">TIMER3</span><span style="font-family:'宋体';">的分频值</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" xml:lang="en-us">16-19</span><span style="font-family:'宋体';">位设置</span><span lang="en-us" xml:lang="en-us">TIMER4</span><span style="font-family:'宋体';">的分频值</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-family:'宋体';">定时器输入频率的计算公式是：</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;text-align:left;" align="left"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Timer input clock Frequency = PCLK / {prescaler value+1} / {divider value}</span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;text-align:left;" align="left"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">{prescaler value} = 0~255</span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">{divider value} = 2, 4, 8, 16</span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p> </p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCON(0X5100 0008)</span><span style="font-size:10pt;font-family:'宋体';">是</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">5</span><span style="font-size:10pt;font-family:'宋体';">个定时器的控制位寄存器，以</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TIMER0</span><span style="font-size:10pt;font-family:'宋体';">为例：</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">0-4</span><span style="font-size:10pt;font-family:'宋体';">位是</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TIMER0</span><span style="font-size:10pt;font-family:'宋体';">的控制位</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Bit0</span><span style="font-size:10pt;font-family:'宋体';">：停止或开始</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TIMER0</span><span style="font-size:10pt;font-family:'宋体';">计时</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Bit1</span><span style="font-size:10pt;font-family:'宋体';">：手动更新</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTB0</span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPB0</span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Bit2</span><span style="font-size:10pt;font-family:'宋体';">：</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TOUT0</span><span style="font-size:10pt;font-family:'宋体';">逻辑电平是否翻转</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Bit3</span><span style="font-size:10pt;font-family:'宋体';">：</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">0-</span><span style="font-size:10pt;font-family:'宋体';">一次性脉冲模式，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">1-</span><span style="font-size:10pt;font-family:'宋体';">自动装载模式</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Bit4</span><span style="font-size:10pt;font-family:'宋体';">：使能或禁止死区功能</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p> </p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Timer0-3</span><span style="font-size:10pt;font-family:'宋体';">各有</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTBn</span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTn</span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPBn</span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPn</span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTOn</span><span style="font-size:10pt;font-family:'宋体';">共</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">5</span><span style="font-size:10pt;font-family:'宋体';">个寄存器，其中</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTn</span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPn</span><span style="font-size:10pt;font-family:'宋体';">是内部寄存器，没有对应的地址，通过读</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTOn</span><span style="font-size:10pt;font-family:'宋体';">的值可以得到</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTn</span><span style="font-size:10pt;font-family:'宋体';">的值。当定时器计数到</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">0</span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTBn</span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPBn</span><span style="font-size:10pt;font-family:'宋体';">的值装入</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTn</span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPn</span><span style="font-size:10pt;font-family:'宋体';">，如果中断使能，同时产生中断。在计数过程中，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTBn</span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPBn</span><span style="font-size:10pt;font-family:'宋体';">的值是不变的，变的是</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTn</span><span style="font-size:10pt;font-family:'宋体';">的值。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Timer0-3</span><span style="font-size:10pt;font-family:'宋体';">各有一个对应的输出脚</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TOUT0-3</span><span style="font-size:10pt;font-family:'宋体';">。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p> </p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Timer4</span><span style="font-size:10pt;font-family:'宋体';">有</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTB4,TCNT4,TCNTO4</span><span style="font-size:10pt;font-family:'宋体';">共</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">3</span><span style="font-size:10pt;font-family:'宋体';">个寄存器，其中</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNT4</span><span style="font-size:10pt;font-family:'宋体';">是内部寄存器，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">Timer4</span><span style="font-size:10pt;font-family:'宋体';">没有对应的输出脚。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p> </p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-size:10pt;font-family:'宋体';">按下面的步骤启动一个定时器：</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt 18pt;text-indent:-18pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><span>1、<span style="font:7pt 'Times New Roman';">  </span></span></span><span style="font-size:10pt;font-family:'宋体';">初始化</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTBn</span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPBn</span><span style="font-size:10pt;font-family:'宋体';">。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt 18pt;text-indent:-18pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><span>2、<span style="font:7pt 'Times New Roman';">  </span></span></span><span style="font-size:10pt;font-family:'宋体';">把相应定时器的手动更新位置</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">1</span><span style="font-size:10pt;font-family:'宋体';">，不管是否使用</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TOUTn</span><span style="font-size:10pt;font-family:'宋体';">极性转换功能，推荐都配置下极性转换功能位。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt 18pt;text-indent:-18pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><span>3、<span style="font:7pt 'Times New Roman';">  </span></span></span><span style="font-size:10pt;font-family:'宋体';">设置相应定时器的启动位启动定时器，同时清除手动更新位。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-size:10pt;font-family:'宋体';">不管定时器是否运行，只要</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TOUTn</span><span style="font-size:10pt;font-family:'宋体';">极性转换位改变，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TOUTn</span><span style="font-size:10pt;font-family:'宋体';">逻辑电平也会变改变。所以推荐极性转换位和人工加载位一起设置。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-size:10pt;font-family:'宋体';">定时器运行时，当</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTn</span><span style="font-size:10pt;font-family:'宋体';">等于</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCMPBn</span><span style="font-size:10pt;font-family:'宋体';">时，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TOUTn</span><span style="font-size:10pt;font-family:'宋体';">输出的电平会翻转，而当</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TCNTn</span><span style="font-size:10pt;font-family:'宋体';">减为</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">0</span><span style="font-size:10pt;font-family:'宋体';">时，产生中断，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">TOUTn</span><span style="font-size:10pt;font-family:'宋体';">的电平又会翻转过来。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p> </p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">S3C2440</span><span style="font-size:10pt;font-family:'宋体';">的</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us">datasheet</span><span style="font-size:10pt;font-family:'宋体';">里举了一个例子，很好的说明的定时器的工作过程，我把它翻译出来。过程图如下：</span></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span style="font-size:10pt;font-family:'宋体';"><a href="https://static.assets-stash.eet-china.com/album/old-resources/2010/4/22/64dea4cb-f940-428e-8113-b98cd2b4de56.gif"><img height="220" alt="点击看大图" src="https://static.assets-stash.eet-china.com/album/old-resources/2010/4/22/64dea4cb-f940-428e-8113-b98cd2b4de56.gif" width="520" /></a></span></p><span style="font-size:10pt;font-family:'宋体';"><br /></span><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">1</font></span><span style="font-size:10pt;font-family:'宋体';">、使能自动装载功能，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTBn</font></span><span style="font-size:10pt;font-family:'宋体';">设为</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">160</font></span><span style="font-size:10pt;font-family:'宋体';">（</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">50+110</font></span><span style="font-size:10pt;font-family:'宋体';">），</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPBn</font></span><span style="font-size:10pt;font-family:'宋体';">设为</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">110</font></span><span style="font-size:10pt;font-family:'宋体';">，置为手动更新标志，把</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTBn</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPBn</font></span><span style="font-size:10pt;font-family:'宋体';">的值装入</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPn</font></span><span style="font-size:10pt;font-family:'宋体';">。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TOUTn</font></span><span style="font-size:10pt;font-family:'宋体';">翻转功能关闭，然后把</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTBn</font></span><span style="font-size:10pt;font-family:'宋体';">设为</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">80</font></span><span style="font-size:10pt;font-family:'宋体';">（</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">40+40</font></span><span style="font-size:10pt;font-family:'宋体';">），</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPBn</font></span><span style="font-size:10pt;font-family:'宋体';">设为</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">40</font></span><span style="font-size:10pt;font-family:'宋体';">，这是为下一次装载设置的。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">2</font></span><span style="font-size:10pt;font-family:'宋体';">、使能定时器开始计时位，清零手动更新位，定时器开始向下计时。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">3</font></span><span style="font-size:10pt;font-family:'宋体';">、当</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">的值和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPn</font></span><span style="font-size:10pt;font-family:'宋体';">的值相等时，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TOUTn</font></span><span style="font-size:10pt;font-family:'宋体';">从低变高。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">4</font></span><span style="font-size:10pt;font-family:'宋体';">、当</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">等于</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">0</font></span><span style="font-size:10pt;font-family:'宋体';">时，产生中断，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTBn</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPBn</font></span><span style="font-size:10pt;font-family:'宋体';">重新装载进</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPn</font></span><span style="font-size:10pt;font-family:'宋体';">，这次的值是</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">80</font></span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">40</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TOUTn</font></span><span style="font-size:10pt;font-family:'宋体';">从高变低。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">5</font></span><span style="font-size:10pt;font-family:'宋体';">、在定时器中断程序中，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTBn</font></span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPBn</font></span><span style="font-size:10pt;font-family:'宋体';">的值设置成</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">80</font></span><span style="font-size:10pt;font-family:'宋体';">（</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">20+60</font></span><span style="font-size:10pt;font-family:'宋体';">）和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">60</font></span><span style="font-size:10pt;font-family:'宋体';">，这是为下一次装载准备的。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">6</font></span><span style="font-size:10pt;font-family:'宋体';">、当</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">的值和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPn</font></span><span style="font-size:10pt;font-family:'宋体';">相等时，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TOUTn</font></span><span style="font-size:10pt;font-family:'宋体';">从低变高。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">7</font></span><span style="font-size:10pt;font-family:'宋体';">、当</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">等于</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">0</font></span><span style="font-size:10pt;font-family:'宋体';">，产生中断，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTBn</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPBn</font></span><span style="font-size:10pt;font-family:'宋体';">重新装载进</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPn</font></span><span style="font-size:10pt;font-family:'宋体';">，这次的值是</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">80</font></span><span style="font-size:10pt;font-family:'宋体';">和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">60.</font></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">8</font></span><span style="font-size:10pt;font-family:'宋体';">、在定时器中断程序中，关闭定时器自动装载和中断功能。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">9</font></span><span style="font-size:10pt;font-family:'宋体';">、当</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">的值和</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCMPn</font></span><span style="font-size:10pt;font-family:'宋体';">相等时，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TOUTn</font></span><span style="font-size:10pt;font-family:'宋体';">从低变高。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">10</font></span><span style="font-size:10pt;font-family:'宋体';">、</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">等于</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">0</font></span><span style="font-size:10pt;font-family:'宋体';">，</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">TCNTn</font></span><span style="font-size:10pt;font-family:'宋体';">不在自动装载，定时器停止计时。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"><font face="Times New Roman">11</font></span><span style="font-size:10pt;font-family:'宋体';">、不会有中断产生。</span><span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span></p><p></p><br /><p class="MsoNormal" style="margin:0cm 0cm 0pt;"></p> <span lang="en-us" style="font-size:10pt;font-family:ArialMT;" xml:lang="en-us"></span><p></p>

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