定时器中断的应用 2

#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar temp,aa,numdu,numwe;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x7b,0x71};
uchar code tablewe[]={
0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
sbit wela=P2^0;
sbit dula=P2^1;
void main()
{
	numdu=0;
	numwe=0;
	aa=0;
	TMOD=0x01; //设置定时器0工作方式1
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;//装初值。	
	EA=1;//开总中断。
	ET0=1;//开定时器0中断。
	TR0=1;//定时器开始工作。
	//temp=0xfe;
	//P1=temp;
	
	while(1)
	{
	     if(aa==20)
		 {	 	
			 aa=0;
		 	 numdu++;
			 if(numdu==9)
			 	numdu=1;
		 	 dula=1;
			 P0=table[numdu];
			 dula=0;
			 wela=1;
			 P0=tablewe[numwe];
			 wela=1;
			 numwe++;
			 if(numwe==8)
			 	numwe=0;
		 }
		
	}		   
}
void timer0() interrupt 1
{
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	aa++;
}