xian_595.c

STC单片机与74HC595的完美组合用最少的IO口控制8位数码管,程序稍微修改就可以用51来控制.充分节约硬件资源

#include <stc12c5412.h>
#include <intrins.h>
#define  uchar unsigned char
               
sbit r_595  =P1^0;          //输入信号
sbit sck_595=P1^1;          //输入时钟
sbit rck_595=P1^2;          //输出时钟

void m_595(unsigned char com);
void s_595(unsigned char m,unsigned char n);
void delay(unsigned char m);

void delay(unsigned char m)
{ 
  unsigned char i,j,k; 
  for(k=1;k<=m;k++)
  {
   for(i=1;i<=125;i++)
    {
      for(j=1;j<=8;j++)
      {
        ;
      }
    }
  }  
}

void m_595(uchar com)
{
  unsigned char i,j;
  for(i=1;i<=8;i++)
   {
     j=com&0x80;
     if(j==0x80)
     {
       r_595=1;
     }
     else
     {
       r_595=0;
     }
      
    sck_595=0;
     _nop_();
    sck_595=1;
    com<<=1;
   } 
    
}

void s_595(unsigned char m,unsigned char n)
{
    m_595(n);
    m_595(m);
    rck_595=0;
    _nop_();
    rck_595=1;
    delay(0);  
}