Blue Bridge Cup - minimum frame

Only keys and nixie tubes are included

#include "stc15.h"  // Or is it  REG52.h  Suggestion is  STC15.h
#define uchar unsigned char
#define uint unsigned int
#define FOSC 12000000L
/* Variable definitions */
uchar Trg=0,Cont=0,flag=0;
uchar menu,set,add,sub;
uchar code LedChar[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
/*   Statement   */
void Init();
void Timer_Init();
void BTN();
void display_u();
void Delay100us();
/*   function  */
void main()
{
	Init();
	Timer_Init();
	while(1)
	{
		if(flag)
		{
            flag=0;
			BTN();
			if(Trg&0x08)
			{
				menu++;
				if(menu==4) menu =1;
			}
			else if(Trg&0x04)
			{
				set++;
				if(set==3) set =1;
			}
			else if(Trg&0x02)
			{
				if(menu ==3) add++;
			}
			else if(Trg&0x01)
			{
				if(menu ==3) sub++;
			}
		}
		
	}
}

void timer0() interrupt 1
{
	static uint flag_cnt=0,dis_cnt=0;
	flag_cnt++;
	if(flag_cnt==10)
	{
		flag=1;
		flag_cnt=0;
	}
    dis_cnt++;
    if(dis_cnt==5)
    {
        dis_cnt=0;
        display_u();
    }
}

void Init()
{
	P2=0XA0;
	P0=0;
	P2=0X80;
	P0=0XFF;
}
void BTN()
{
	unsigned char dat=P3^0xff;
	Trg = dat & (dat^Cont);
	Cont = dat;
}
void Timer_Init()
{
	AUXR |= 0x80;
	TL0 = 0xCD;
	TH0 = 0xD4;
	TR0 = 1;
	ET0 = 1;
	EA  = 1;
}
void display_u() 
{
	uchar dis[8],i;
	dis[0]=0Xc1;//0Xc1  0X88
	dis[1]=0XFF ;
	dis[2]=0XFF;
	dis[3]=0XFF;
	dis[4]=0XFF;
	dis[5]=0XFF;
	dis[6]=0XFF;
	dis[7]=0XFF;
	for(i=1;i<8;i++)
	{
		if(dis[i]==LedChar[0])
		{
			dis[i]=0xff;
		}
		else break;
	}
	for(i=0;i<8;i++){
		P2&=0x1f;
		P0=1<<i;
		P2|=0xc0;
		P2&=0x1f;
		P0=dis[i];
		P2|=0xe0;
		Delay100us(); 
		P0=0xff;
	}
	P2&=0x1f;
}
void Delay100us()		//@12.000MHz
{
	unsigned char i, j;

	i = 2;
	j = 39;
	do
	{
		while (--j);
	} while (--i);
}