幽游梦蝶 

 你的定时器中断程序有问题，我改动了一些，自己再找
/*TO中断服务子程序 */
void  timer0(void) interrupt 1 using 2
{   
    TR0=0;
    if(p1reg^P1)
    {
        if(_tt1==0)//不是if(_tt1=0)!!!!!!!!!
            _tt1=1;
        else
        {
            if(_tt1>20)   /*防抖动*/
            {
                key=P1;
                key|=0xF0;
                key=~key;
                switch(key)
                {
                    case 1:
                        p20=!p20;
                        break;
                    case 2:
                        p21=!p21;
                        break; 
                    case 4:
                        p22=!p22;
                        break;
                    case 8:
                        p23=!p23;
                        break;
                    default:
                        break;
                }
            }
            _tt1=0;
        }          
        p1reg=P1;        
     } 
    else
        if(_tt1>0) _tt1++;
   _tt2++;
   sett0();
}


发表时间:2002年5月23日18:28:00