74hc595.c

这里给出74hc595的c51驱动程序。带锁存功能的串入并出芯片。

//定时器晶体振荡器11.0592M.
＃i nclude<reg51.h>
＃i nclude <INTRINS.H>
#define uint unsigned int
#define uchar unsigned char
#define nop() _nop_();_nop_();

sbit CLK=P2^0;
sbit DAT=P2^1;
sbit RCLK=P2^2;
//sbit CS=P2^3;


uchar code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xbf,0xff};//0-9,-,全灭

 

void sendbyte(uchar byte)
{    
        uchar num,c; 
        num=tab[byte];
        
   for(c=0;c<8;c++)
        {
         CLK=0;
         DAT=num&0x80;
         num=num<<1;
         
         CLK=1;
         }
//         RCLK=0;
//         nop();
//         nop();
//         RCLK=1;
         
}

void out595(void)
{
        RCLK=0;
        nop();
        RCLK=1;
}

void display(uchar word)
{
 uchar i,j;
 i=word/10;
 j=word-10*i;
 sendbyte(j);
 sendbyte(i);
 out595();
}


main()
{   
    while(1)
    { 
     display(19);
     display(86);
    }
    while(1);
    
}