用定时器T0查询方式P0口8位控制LED闪烁

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
void main (void)
{   uchar i=0;
	TMOD=0x01;              
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	TR0=1;
	TF0=0;
	P0=0xff;
	while(1)
	{
		while(TF0==1)
		{  
			i++;			
			if(i==20)
			{
				i=0;

				P0=~P0;

			}
			TF0=0;
			TH0=(65536-50000)/256;
			TL0=(65536-50000)%256;

		}
	}
}