/*
Author Nikhil Arora
ele.nikhil@gmail
Learning SDCC
Interrupt caused when P3.2 is made low negativetransition
Program in main loop goes on parallelly
*/
#include <at89x051.h>

//external interrupt 0 uses register bank 1
void extint0_isr (void) interrupt 0 using 1
{
P1 = ~P1;
}


void main(void)
{
int i;
char j;

IT0 = 1; //Edge triggered
EX0 = 1; /* ENABLE GLOBAL INTERRUPT */
EA = 1; /* ENABLE GLOBAL INTERRUPT */


while(1)
{
P3_7 = !P3_7;
for(i=0;i<1000;i++)
{
for(j=0;j<100;j++){}
}
P3_7 = !P3_7;
for(i=0;i<1000;i++)
{
for(j=0;j<100;j++){}
}
}

}