main.c

三位数码管正计时程序

 
 
 #include <reg51.h>
 #define uchar unsigned char
 #define uint  unsigned int
 
 uchar k,n;

 void main(void)
 {
 
  switch (P1&0x0F)
  {
    case 0: n = 0;break;
	case 1: n = 1;break;
	case 2: n = 2;break;
	case 3: n = 3;break;
	case 4: n = 4;break;
	case 5: n = 5;break;
	case 6: n = 6;break;
	case 7: n = 7;break;
	case 8: n = 8;break;
	default: n = 9;break;
   
  }
 }