13+

13例常用仿真电路

#include <AT89X51.H> 
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66, 
                            0x6d,0x7d,0x07,0x7f,0x6f}; 
unsigned char Count; 

void delay10ms(void) 
{ 
  unsigned char i,j; 
  for(i=20;i>0;i--) 
  for(j=248;j>0;j--); 
} 

void main(void) 
{ 
	Count=0;
  while(1) 
    { 
		
	  if(P3_7==0) 
	    { 
	      delay10ms(); 
	      if(P3_7==0) 
	        { 
	          Count++; 
	          if(Count==100) 
	            { 
	              Count=0; 
	            } 
	          while(P3_7==0); 
	        } 
			P0=table[Count/10];
			P2=table[Count%10];
	    } 	
    } 
}