74ls164和51寫的簡單流水燈

#define uchar unsigned char
#define uint unsigned int
sbit clk=P2^0;
sbit dat=P2^4;

void ls164(uchar x)
{
uchar i;
clk=0;
for(i=0;i<8;i++)
{
x=(x>>1);
dat=CY;
clk=1;
clk=0;
}

}

void main()
{
ls164(98);
while(1);

}