51

计算机控制系统

#include    <reg51.h>
#include    <absacc.h>
#define		Led_dat		XBYTE[0xcfe8]
#define		Led_ctl		XBYTE[0xcfe9]

void Display_byte(unsigned char loc,unsigned char dat)
  {
   unsigned char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
   loc &=0xf;
   Led_ctl = loc|0x80;
   Led_dat = table[dat>>4];     /*显示高4位*/
   loc++;
   Led_ctl = loc|0x80;
   Led_dat = table[dat&0xf];    /*显示低4位 */   
  }

void main(void)
  {
   Led_ctl = 0xd1;
   while((Led_ctl&0x80)==0x80);
   Led_ctl = 0x31;
   while(1)
     {
      if((Led_ctl&0xf)==0)  continue;
      Led_ctl = 0x40;
      Display_byte(0,Led_dat);
     }
   
  }