STC单片机PCA产生PWM程序
stc12 15单片机的pca模块产生pwm的完整例程，测试成功。完整代码下载：http://www.51hei.com/f/stcpcaPWM.zip
#include <reg51.h>
#include "PCA.h"
void PWM(unsigned int num,int cex);
void main()
{
CMOD=0x02;
CL=0x00;
CH=0x00;
PWM(10,0);
PWM(20,1);
PWM(50,2);
PWM(70,3);
PWM(90,4);
CR=1;
while(1);
}
void PWM(unsigned int num,int cex)
{
double i=256*(100-num)/100;
switch(cex)
{
case 0: CCAP0L=i; CCAP0H=i; CCAPM0=0x42; break;
case 1: CCAP1L=i; CCAP1H=i; CCAPM1=0x42; break;
case 2: CCAP2L=i; CCAP2H=i; CCAPM2=0x42; break;
case 3: CCAP3L=i; CCAP3H=i; CCAPM3=0x42; break;
case 4: CCAP4L=i; CCAP4H=i; CCAPM4=0x42; break;
}
}
头文件：
#ifndef _SST_PCA_H_
#define _SST_PCA_H_
sfr CH=0xF9;
sfr CL=0xE9;
sfr CMOD=0xD9;
sfr CCON=0xD8;
sfr CCAPM0=0xDA;
sfr CCAPM1=0xDB;
sfr CCAPM2=0xDC;
sfr CCAPM3=0xDD;
sfr CCAPM4=0xDE;
sfr CCAP0H=0xFA;
sfr CCAP1H=0xFB;
sfr CCAP2H=0xFC;
sfr CCAP3H=0xFD;
sfr CCAP4H=0xFE;
sfr CCAP0L=0xEA;
sfr CCAP1L=0xEB;
sfr CCAP2L=0xEC;
sfr CCAP3L=0xED;
sfr CCAP4L=0xEE;
/*CCON*/
sbit CF=CCON^7;
sbit CR=CCON^6;
sbit CCF4=CCON^4;
sbit CCF3=CCON^3;
sbit CCF2=CCON^2;
sbit CCF1=CCON^1;
sbit CCF0=CCON^0;
#endif