t0zhd.c

单片机外部中断、定时器、LED显示程序

/*定时器实验1-查询方式-高低位灯互闪*/
//====声明区=============================
#include <reg51.h>
#define LED P2
#define count 50000
#define TH_M1 (65536-count)/256
#define TL_M1 (65536-count)%256
int IntCount=0;
//=====主程序============================
main()
{ IE=0x82;
  TMOD=0x01;
  TH0=TH_M1;
  TL0=TL_M1;
  TR0=1;
  LED=0xf0;
  while(1);
}
//===T0中断子程序--每中断5次，LED反相====     
void timer0(void) interrupt 1
{  TH0=TH_M1;
   TL0=TL_M1;
   if(++IntCount==50)
   {  IntCount=0;
      LED^=0xff;
   }
}