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两个74HC595D级联，控制八位数码管，我用的是89C52RC，上程序！！
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
void delay(int xms);
void send595(uchar dat);
void out595(void);
void xianshi(uchar w,uchar d);
void guanbi();
sbit MOSIO=P2^2;
sbit R_CLKa=P2^3;
sbit S_CLKa=P2^4;
uchar code duan[]={~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,~0x7D,~0x07,~0x7F,~0x6F};
uchar code wei[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
int m=0;
void main()
{TMOD=0x01;
TH0=(65536-45872)/256;
TL0=(65536-45872)%256;
EA=1; //开总中断
ET0=1; //开定时器中断
TR0=1; //启动定时器
guanbi();
while(1)
{}
}
void T0_time()interrupt 1
{ TH0=(65536-45872)/256;
TL0=(65536-45872)%256;
xianshi(m,m);
m++;
if(m==8)m=0;
}
void delay(int xms)
{
int i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}
void send595(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
if((dat<<i)&0x80)MOSIO=1;
else MOSIO=0;
S_CLKa=0;
S_CLKa=1;
}
}
void out595(void)
{R_CLKa=0;
R_CLKa=1;}
void xianshi(uchar w,uchar d)
{
send595(wei[w]);
send595(duan[d]);
out595();
}
void guanbi()
{
send595(0);
//send595(0);
//out595();
send595(0xff);
out595();
}
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