74HC595

74HC595

输入：串行输入

输出：并行/串行输出

用74HC595做一个流水灯

电路图

程序

/*======================
  测试74HC595
  =======================*/

#include <REGX51.H>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit st_cp = P3^;
sbit sh_cp = P2^;
sbit ds = P3^;
uchar led = 0xfe;

void message_get(uchar led);
void message_send();
void delay(uchar time_delay);

void main()
{
    while()
    {
        message_get(led);
        message_send();
        delay();
        led = _crol_(led, );
    }
}
//将数据放到移位寄存器中
void message_get(uchar led)
{
    uchar i = ;
    for(; i < ; i ++)
    {
        sh_cp = ;
        ds = led & 0x80;
        led <<= ;
        delay();
        sh_cp = ;//上升沿
    }
}
//将数据从移位寄存器中放到存储寄存器中
void message_send()
{
    st_cp = ;
    delay();
    st_cp = ;//数据从移位寄存器放到数据寄存器中
}
void delay(uchar time_delay)
{
    uchar x,y;
    for(x = time_delay; x > ; x--)
        for(y = time_delay; y > ; y--)
        {}
}