74HC595的单片机驱动程序 -

标题: 74HC595的单片机驱动程序 [打印本页]

作者: 我是小温 时间: 2017-12-12 08:36
标题: 74HC595的单片机驱动程序
#include<reg52.h>
#include<intrins.h>
sbit si=P2^2;  //数据线  74hc595的14管脚
sbit rck=P2^3;  //输出储存器锁存时钟线 74hc595的12管脚
sbit sck=P2^4;  //数据输入时钟线          74hc595的11管脚
sbit sclr=P2^5; //移位寄存器清零端  74hc595的10管脚
void delay(unsigned char p)
{
      unsigned char i;
      while(p--)
      {
      for(i=110;i>0;i--);
      }
}
void write_data(unsigned char pp)
{
            unsigned char i;
            sclr=1;
            for(i=0;i<8;i++)
      { sck=0;
            if(pp&0x80)
            si=1;
            else si=0;
            sck=1;
            pp<<=1;
      }
            rck=0;
            delay(5000);
            rck=1;
            delay(5000);
            rck=0;
}
void main()
{
      unsigned char q=0xfe;
      sclr=0;
      delay(5000);
      sclr=1;
      while(1)
      {
      write_data(q);
      delay(1);
      q=_crol_(q,1);
      delay(25000);
}
}

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