/////////PCA CEX1為頻率輸出模式//////////////
/////////PCA CEX4 捕捉模式 測試程序/////////
/////////FRE_OUT.c//////////////////////////
#include <C8051F040.h>
typedef unsigned int uint;
typedef unsigned char uchar;
typedef unsigned long ulong;
sfr16 RCAP2=0xca;
sfr16 RCAP3=0xca;
sfr16 RCAP4=0xca;
sfr16 TMR4=0xcc;
sfr16 TMR3=0xcc;
sfr16 TMR2=0xcc;
sfr16 PCA0CP0=0xfb;
sfr16 PCA0CP1=0xfd;
sfr16 PCA0CP2=0xe9;
sfr16 PCA0CP3=0xeb;
sfr16 PCA0CP4=0xed;
sfr16 PCA0CP5=0xe1;
uchar temppage;
xdata ulong pcacap4[10];
void pca0ini(){//CEX0為頻率輸出模式
	SFRPAGE = 0x00;
	PCA0CPM0=0X46;
}
void cex0_fre_set(uchar time){//頻率輸出為:(PCA時鐘頻率)/(2*time)
	SFRPAGE = 0x00;
	PCA0CPH0=time;
}
void pca4ini(){//PCA CEX4配置為正負邊沿均捕捉
	SFRPAGE=0x00;
	PCA0CPM4 = 0x31;    // 正負邊沿觸發模式，CEX4捕捉中斷使能
 	PCA0CPL4 = 0x00;    
 	PCA0CPH4 = 0x00;    
}
void pcaini(){
	SFRPAGE=0x00;
	PCA0MD=0x09;//PCA采用系統時鐘，且PCA溢出中斷開啟
	PCA0CN=0x40;//啟動PCA計數器
	EIE1|=0x08;//PCA中斷使能
}
void config(){
//看門狗禁止
	WDTCN = 0x07;	
    WDTCN = 0xDE;   
   	WDTCN = 0xAD;
	SFRPAGE = 0x0F;
//交叉開關配置，CEX4配置在P0.4
	XBR0 = 0x30;	
	XBR1 = 0x00;	
	XBR2 = 0x40;
 	XBR3 = 0x00;   
//管腳輸出配置，P0口為開漏輸出，其中P0.6接上拉電阻，P0為數字輸入口
 	SFRPAGE = 0x0F;
 	P0MDOUT = 0x00; 
 	P1MDIN = 0xFF;  
//晶振配置，采用內部晶振8分頻
	SFRPAGE = 0x0F;
 	CLKSEL = 0x00;  
	OSCXCN = 0x00;	
	OSCICN = 0x84;	
}
void main(void){//測試時將P0.4與P0.0口相連
	xdata uchar fre_set=230;
	config();
	EA=1;
	pcaini();
	pca4ini();
	pca0ini();
	cex0_fre_set(fre_set);
	while(1);
}
void PCA_ISR(void) interrupt 9  {
	static xdata  uchar num1=0,cfnum=0;
	static xdata uint tmpcnt=0;
	if(CF){
		cfnum++;
		CF=0;
	}
	if(CCF4){
		if(PCA0CP4<tmpcnt)
			cfnum--;
		pcacap4[num1]=PCA0CP4-tmpcnt;
		pcacap4[num1]+=65536L*cfnum;
		tmpcnt=PCA0CP4;
		num1++;
		cfnum=0;
		if(num1>=10){
			num1=0;
		}	
		CCF4=0;
	}
  }