代码：

#include <mega16.h>

// Declare your global variables here
#define hc165_clk PORTB.0
#define hc165_lp PORTB.1
#define hc165_out PINB.2

unsigned char read_hc165(void)
{
    unsigned char data=0,i,temp=0x80;
     hc165_lp=0;
     hc165_lp=1; 
     for(i=0;i<=7;i++)
     {
        if(hc165_out)
        data|=temp;
        hc165_clk=1;
        temp=temp>>1;
        hc165_clk=0;
     }
     return data;
}
void main(void)
{
// Declare your local variables here
   PORTA=0XFF;
   DDRA=0XFF;
   PORTB=0X06;
   DDRB=0X03;
     
while (1)
      {
      // Place your code here
         PORTA=~read_hc165();
      }
}

仿真效果图：