File: test_extit.c

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#include <reg51.h>

sfr at 0xa6 WDTRST;

void jaj() interrupt 0 { P2= P0; P0++; }

void main()
{
	IT0=0; /* low level triggered */
	IT0=1; /* falling edge triggered */
	EX0=1; /* enable ex #0 */
	EA=1;
	P0=0;
	for(;;);
}