1000－99计数器.c

C51学习书

#include <reg51.h> //1000－99计数器
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; 
  P0=table[Count/10]; 
  P2=table[Count%10]; 
  while(1) 
    { 
      if(P3_7==0) 
        { 
          delay10ms(); 
          if(P3_7==0) 
            { 
              Count++; 
              if(Count==100) 
                { 
                  Count=0; 
                } 
              P0=table[Count/10]; 
              P2=table[Count%10]; 
              while(P3_7==0); 
            } 
        } 
    } 
}