#include

/************************************************/
sbit Key=P2^0;
static unsigned char p=0;

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void delay1ms(unsigned int count)
{
int x,y;
for(x=0;x for(y=0;y<120;y++);
}
/************************************************/
void ScanKey()
{
if(Key==0)
{
delay1ms(1);
if(Key==0)
{
p++;
if(p==8) p=0;
}
while(Key==0); //按鍵鎖定，每次按鍵只加1
}
}
/************************************************/
void main()
{
unsigned char i;
unsigned char a,b;
unsigned char temp=0x0f;
while(1)
{ ScanKey();
for(i=0;i<8;i++)
{
a=temp< b=temp>>(8-p);
P0=a|b;
}
}
}