走马灯小程序

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

uchar t1 = 0;
//-------------------------------
void TIME0()interrupt 1
{
  TH0 = 0xD8;              //初值.
  TL0 = 0xF0;              //10ms @ 12MHz
  t1++;
}
//-------------------------------
void main()                //主函数.
{
  uchar i, aaa = 0xfe;
  TMOD = 0x01;             //定时器0 
  TH0 = 0xD8;              //初值.
  TL0 = 0xF0;              //10ms @ 12MHz
  TR0 = 1;
  ET0 = 1;
  EA = 1;
  P0 = 0x00;               //全亮.
  while (t1 != 200);       //等待2000ms
  t1 = 0;
  aaa = 0xfe;
  P0 = aaa;                //P1.0发光.
  while (1) {
    for (i = 0; i < 7; i++) {