#include <reg52.h>
#define unit unsigned int
#define uchar unsigned char

sbit P3_0=P3^0;
sbit P3_1=P3^1;
sbit P3_2=P3^2;
sbit P3_3=P3^3;
int i=0;

uchar code th0[40]={256,255,254,253,253,252,252,252,251,251,251,251,252,252,252,253,253,254,255,256 ,
                       256,255,254,253,253,252,252,252,251,251,251,251,252,252,252,253,253,254,255,256};
uchar code tl0[40]={159,223,39,122,221,84,226,138,78,48,48,78,138,226,84,221,122,39,223,159 ,
                          159,223,39,122,221,84,226,138,78,48,48,78,138,226,84,221,122,39,223,159};
uchar code th1[40]={251,252,253,254,254,255,255,256,256,256,256,256,256,255,255,254,254,253,252,251 ,
                 251,252,253,254,254,255,255,256,256,256,256,256,256,255,255,254,254,253,252,251};
uchar code tl1[40]={127,63,247,164,65,202,60,148,208,238,238,208,148,60,202,65,164,247,63,127,
                127,63,247,164,65,202,60,148,208,238,238,208,148,60,202,65,164,247,63,127};
void init()
{
 TMOD=0X11;
 TH0=th0[i];
 TL0=tl0[i];
 TH1=th1[i];
 TL1=tl1[i];
 }

 void  spwm()
 {
 init();
        P3_0=~P3_0;
        P3_1=~P3_1;
        P3_2=~P3_2;
        P3_3=~P3_3;
 EA=1;
 ET0=1;
 ET1=1;
 TR0=1;
 TR1=0;
  }
void timer0(void) interrupt 1
 {
        P3_0=~P3_0;
        P3_1=~P3_1;
        P3_2=~P3_2;
        P3_3=~P3_3;
     TR1=1;
     TR0=0;
     TH0=th0[i++];
     TL0=tl0[i++];
   }

void timer1(void) interrupt 3
{
        P3_0=~P3_0;
        P3_1=~P3_1;
        P3_2=~P3_2;
        P3_3=~P3_3;
 TR0=1;
 TR1=0;
 TH1=th1[i++];
 TL1=tl1[i++];
  }

 void main()
 {
     spwm( );

     while(1){if(i>40){i=0;}};                                                                                                                                                                   while(1);
}