PCA-PWM01ķPCA0(PWM0-CCP0)Ϊ

PCA_PWM0 &= ~0x02;	// PWM0
PCA_PWM0 |= 0x3f, CCAP0H = 0xff, CCAP0L = 0xff;	// PWM0һֱ0
PCA_PWM0 &= 0xc0, CCAP0H = 0,    CCAP0L = 0;	// PWM0һֱ1
