22B-D012N104BD

22B-D012N104BD

22B-D012N104BD

• 假设一个PWM从0计数到80，之后又从0计数到80....... 这个就是单斜率

• 假设一个PWM从0计数到80，之后是从80计数到0....... 这个就是双斜率

可见，双斜率的计数时间多了一倍，所以输出的PWM频率就慢了一半，但是分辨率却是1：(80+80)=1:160，就是提高了一倍。

假设PWM是单斜率，设定高计数是80，我们再设定一个比较值是10，那么T/C从0计数到10时(这时计数器还是一直往上计数，直到计数到设定值80)，单片机就会根据你的设定，控制某个IO口在这个时候是输出1还是输出0还是端口取反，这样，就是PWM的基本的原理了。

22B-D012N104BD 

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