counter60.c

单片机外部中断、定时器、LED显示程序

/*60s计数器，每一分钟LED反相1次*/
//===声明区===========================
#include <reg51.h>
#define SEG P2
#define SCANP P1
sbit LED=P0^7;
/*声明T0定时相关声明*/
#define count_M1 50000
#define TH_M1 (65536-count_M1)/256
#define TL_M1 (65536-count_M1)%256
int count_T0=0;
/*声明扫描相关声明*/
#define count_M2 250
#define TH_M2 (256-count_M2)
#define TL_M2 (256-count_M2)
int count_T1=0;
/*声明7段数码管驱动信号数组（共阳）*/
unsigned char TAB[]={0xc0,0xf9,0xa4,0xb0,0x99,//0-4
                     0x92,0x83,0xf8,0x80,0x98};//5-9
char disp[2]={0xc0,0xc0};
/*声明基本变量*/
char seconds=0;
char scan=0;
//===主程序==============================================
main()
{ IE=0x8a;
  TMOD=0x21;
  TH0=TH_M1;
  TL0=TL_M1;
  TR0=1;
  TH1=TH_M2;
  TL1=TL_M2;
  TR1=1;
  LED=1;
  while(1);
}
//===T0中断子程序--计算并显示秒数==============     
void T0_1s(void) interrupt 1
{  TH0=TH_M1;
   TL0=TL_M1;
   if(++count_T0==20)
   {  count_T0=0;
      seconds++;
	  if(seconds==60)
	  {   seconds=0;
	      LED=~LED;
	  }
   }
   disp[1]=TAB[seconds/10];
   disp[0]=TAB[seconds%10];
}
//===T1中断子程序--扫描==============     
void T1_8ms(void) interrupt 3
{  if(++count_T1==32)
   {  count_T1=0;
	  if(++scan==3)
	  scan=1;
	  SEG=0xff;
 	  SCANP=~scan;
	  SEG=disp[scan-1]; 
   }
}//T1中断子程序结束===================