舍友仅仅打了一把游戏，我就学会了如何学会了8255

#include "reg51.h"
#include "absacc.h"
#define pa XBYTE[0x0000] //8255A口地址设置
#define pb XBYTE[0x0100] //8255B口地址设置
#define pc XBYTE[0x0200] //8255C口地址设置
#define con XBYTE[0x0300] //8255控制字端口地址设置
sbit p3_4 = P3^4; 
unsigned char t=0x0, n;

void delay(unsigned int j) //延时程序
{
	unsigned int i;
	for(i = 0 ;i <200;i++)
		for(j = 0 ;j <200;j++);
	
}

void Init() //初始化8255
{
	con = 0x82;
}

void kg() //开关控制D1-D6的亮灭
{
	t = pb;
	t = ~t;
	pa = t;
}

void lm() //中断0控制亮灭
{
	EA = 1;
	EX0 = 1;
	IT0 = 1;
	pa = t;
}

void jishu() //T1计数
{
	TMOD = 0x55; 
	EA = 1;      
	TH0 = 0xff;  
	TL0 = 0xff;  
	ET0 = 1;    
	TR0 = 1;  
}

void jishu1() //T1计数，方法2(暂时无效)
{
	EA = 1;
	ET0 = 1;
	TMOD = 0x05;
	TH0 = 0x00;
	TL0 = 0x00;
	TR0 = 1;
}

void lsd() //流水灯
{
	unsigned int temp,i;
	temp = 0x01;
	for(i = 0;i < 8;i++){
		pa = temp;
		temp = temp<<1;
		delay(200);
	}
	
}

void main()
{
	pa = 0x00;		
}

void zd() interrupt 0
{
	t = ~t;
}


void js() interrupt 1
{
	n++;
	pa = n;
	TH0 = 0xff;
	TL0 = 0xff;
}