ex4-5.c

单片机的仿真实例!用的是Proteus作的,大家有需要的尽管下吧

#include <reg51.h>
#include <stdio.h>

#define byte unsigned char

//中断服务程序
void keyinterrupt()   interrupt 2
{
	int t;
	byte keycode,scancode,flag=0xff;
	t=5000;
	while(t--);
	if(INT1==1)
		return;
	EX1=0;
	scancode=0xef;
	while(scancode!=0xff)
	{
		P1=scancode;
		keycode=P1;
		if((keycode&0x0f)!=0x0f)
			break;
		scancode=(keycode<<1)|0x0f;
	}
	keycode=~keycode;

	P2=keycode; //将扫描码输出，数码管采用具有译码功能的数码管
	P1=0X0F;
	while(1)
	{
		if(INT1==1)
		{
			flag=~flag;
			if(flag==0)
			break;
		}
		t=10000;
		while(t--);
	}
	EX1=1;
	return;
}

void main(void)
{    
	IE=0;
	EX1=1;
	EA=1;  //中断open
	P2=0XFF;
	P1=0X0F;
    while(1)
    {		
	}                  
}