/* --- STC12C5axx Series MCU Ext1(Falling edge) Demo ---------------*/


#include "reg51.h"

//External interrupt1 service routine
void exint1() interrupt 2           //(location at 0013H)
{
}

void main()
{
    IT1 = 1;                        //set INT1 int type (1:Falling only 0:Low level)
    EX1 = 1;                        //enable INT1 interrupt
    EA = 1;                         //open global interrupt switch

    while (1);
}