void InitPWM(void)
{
EA = 0;
CCON = 0x00; //初始化PCA寄存器
CMOD = 0x00; //時鐘12分頻,禁止溢出中斷
CL = 0; //初始化PCA計數器
CH = 0;
CCAP0H = CCAP0L = 0x80; //占空比00%
CCAPM0 = 0x63; //8位PWM,由低變高產生中斷
CR = 1; //PCA時鐘開始工作
}
要多少的PWM,設置PCA_PWM0、CCAP0H 、 CCAP0L就行了