使用STC12C5AXXS2的单片机实现准确的脉宽调制（PWM）。本程序演示在CCP0（P1.3）输出占空比可调的矩形波，使用单片机内部资源，主程序只需执行数条控制代码。-STC12C5AXXS2 use of single-chip pulse width modulation to achieve accurate (PWM). Demonstration of this procedure in CCP0 (P1.3) output with adjustable duty cycle rectangular wave, the use of single-chip internal resources, the main program there is no need to implement the code.