PIC16F877A A/D转换方法，CCP1的PWM功能使用方法。 将A/D转换值直接写入PWM作为占空比参数，用RC2驱动发光二极管。-PIC16F877A A/D conversion method, CCP1 of the PWM feature uses method. The A/D conversion value is directly written into the PWM as an duty cycle is parameter, Used RC2 drive the