定时器中断 流水灯实验

这个星期学习了一点简单的单片机控制程序：二极管的点亮，流水灯，数码管的亮灯，定时器中断计时。
// 用定时器中断做出来的流水灯和数码管的点亮
#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned cint
uchar num,tt,aa;
sbit wela=P2^7;
sbit dula=P2^6;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void main()
{ aa=0;
 num=1;
 tt=0;
 TMOD=0x11;
 TH0=(65535-50000)/256;
 TL0=(65535-50000)%256;
 TH1=(65535-10000)/256;
 TL1=(65535-10000)%256;
 EA=1;
 ET0=1;
 ET1=1;
 TR0=1;
 TR1=1;
 wela=1;
 P0=0xfe;
 wela=0;
 dula=1;
 P0=table[0];
 dula=0;
 P1=0xfe;
 while(1)
 {
  if(tt==2)
  {
   tt=0;
   dula=1;
   P0=table[num];
   dula=0;
   num++;
   if(num==10)
    num=0;
  }
  if(aa==2)
  {  aa=0;
   P1=_crol_(P1,1);
  }
 // delay(10000);
 // P1=_crol_(P1,1);

 }
}
void timer0() interrupt 1
{
 TH0=(65535-50000)/256;
 TL0=(65535-50000)%256;
 tt++;
}
void timer1()interrupt 3
{
 TH1=(65535-10000)/256;
 TL1=(65535-10000)%256;
 aa++;
}