244.c

单片机开发资料光盘-双龙-686M.zip

#include <AT89X51.H>
unsigned char xdata led _at_ 0xf700;
volatile unsigned char xdata sw_dip _at_ 0x7f00;
void main(void)
{
 while(1)
   {
    led=sw_dip;
   }
}