51 microcontroller learning: external interrupt 1 experiment

Experiment name: External interrupt 1 Experiment
wiring description:
Experiment phenomenon: After downloading the program, pressing the K4 key can control the D1 indicator light to turn on and off.
Notes:
******************* *************************************************** ******************/
#include "reg52.h"

typedef unsigned int u16; //Redefine the system default data type
typedef unsigned char u8;

//Define LED1 pin
sbit LED1=P2^0;

//Define independent button K4 control pin
sbit KEY4=P3^3;

/****************************************************** ****************************
* Function name: delay_10us
* Function function: Delay function, when ten_us=1, the delay is approximately 10us
* Input: ten_us
* Output: None
**************************************** ***************************************/
void delay_10us(u16 ten_us)
{
while(ten_us --);
}

/****************************************************** ******************************
* Function name: exti1_init
* Function function: External interrupt 1 configuration function
* Input: None
* Output : none
************************************************ *****************************/
void exti1_init(void)
{
IT1=1;//Edge trigger mode ( Falling edge)
EX1=1;//Turn on the interrupt enablement of INT1
EA=1;//Turn on the total interrupt
}

/****************************************************** ******************************
* Function name: main
* Function function: main function
* Input: None
* Output: None
* *************************************************** ******************************/
void main()
{
exti1_init();//External interrupt 1 configuration

while(1)
{

}
}

void exti1() interrupt 2 //External interrupt 1 interrupt function
{
delay_10us(1000);//Destroy
if(KEY4==0)//Determine again whether the K4 key is pressed
LED1=!LED1;//LED1 status flip
}