main.c

some reference exercise of C language

// Khai bao cac file header
#include	<AT89X52.H>
#include	<Kit8051.h>

// Khai bao cac bien toan cuc

// Khai bao cac ham
void InitSystem(void);

// Dinh nghia cac ham
void InitSystem(void)
{
	// Cam LCD
	LCD_E = 0;
	// Chon ngat theo suon xuong
	IT1 = 1;
	// Cho phep ngat ngoai 1
	EX1 = 1;
	EA = 1;
}
void ExternalInterrupt(void) interrupt IE1_VECTOR
{
	// Dao trang thai cua cong P0 (trang thai cac LED) khi co ngat
	P0 = ~P0;
}

// Chuong trinh chinh
void main(void)
{
	// Khoi tao he thong
	InitSystem();
	// Vong lap vo tan
	while(1);
}