前三讲总结，MSP430

我就是我 2023-03-02 04:51 3阅读 0赞

学习了，时钟，GPIO，这次学习定时器  
定时器：是所有单片机内均设置有的一项重要资源，主要用于实现定时、计数等功能：定时：对单片机内部的时钟脉冲数数。计数：对单片机外部输入来的信号数数。  
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MSP430G2553内部有一个异步16位定时器，Time1\_A3![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk1OTc0Mw_size_16_color_FFFFFF_t_70 1]  
Time0\_A3引脚未能引出，用它没用  
430定时器与其他单片机定时器的区别  
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定时器的两大结构：主计数值寄存器，捕获/比较模块  
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Time1\_A3有3个捕获比较寄存器，CCR是用来装预设值。

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430的比较功能是定时器最重要的功能  
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第四大功能 Time0  
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第五大功能，强悍，中断 定时事件一到马上中断  
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学单片机，主要就是学寄存器，接下来讲定时器的寄存器  
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CCR0是主控，管家  
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捕获比较寄存器用来存初值  
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计数周期最长的是连续计数模式continuous,功能最全面的增减模式，使用最多的up模式  
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定时器的时钟选择  
TASSEL\_x选择合适的时钟  
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定时器一般都要玩中断

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