void SysClkInit(void)//配置系统时钟
 
{
 int n = 0;
 OSCXCN = 0x67;
 for (n = 0; n < 255; n++) ;
 while ( (OSCXCN & 0x80) == 0 );
 OSCICN = 0x0C;
}
 
void SystemInit(void)//系统配置
{
WDTCN = 0xDE;   // 关闭 WDT
WDTCN = 0xAD;
}
 
void PortInit(void)//端口配置
{
//交叉开关配置
 XBR0 = 0x10;
 XBR1 = 0x00;
 XBR2 = 0x40;
 // P0 口分配状况
 // P0.0 = CEX0
 // P0.1 = CEX0
}
 
void PCA_Init(void)
{
 EIE1 |= 0x08;
 PCA0MD = 0X01;//系统时钟的12分频
 PCA0L = 0x00;
 PCA0H = 0x00;
 PCA0CPM0 = 0xcb;
 PCA0CPM1 = 0xcb;
 PCA0CPM0 |= 0x40; //开启CCFn中断
 PCA0CPM1 |= 0x40; //开启CCFn中断
 //PWM频率计算：系统时钟/12/计数=22118400/12/65536=28.125
 
}
 
void PCA_CPHL0(unsigned int PWM)
 
{
 PCA0CN &= ~0x40;
 PCA0CPL0 = (0xff &  PWM);
 PCA0CPH0 = (0xff & (PWM >> 8));
 PCA0CN |= 0x40;
}
 
void PCA_CPHL1(unsigned int PWM)
 
{
 PCA0CN &= ~0x40;
 PCA0CPL1 = (0xff & PWM);
 PCA0CPH1 = (0xff &(PWM >> 8));
 PCA0CN |= 0x40;
}
 
void PCA_ISR(void) interrupt 9
{
 if (CCF0) {
 CCF0 = 0;
 } else if (CCF1) {
 CCF1 = 0;
 } else if (CF) {
 CF = 0;
 }
}