sbit s1=P1^0;
sbit s2=P1^1;
sbit s3=P1^2;
uchar s1num;
void keyscan()
{
	if(s1==0)
	{
		delay(10);
		if(s1==0)
		{	
			s1num++;
			while(!s1);
			if(s1num==1)
			{
				write_a(0x80,0x80);
				write_com(0x80+0x40+6);
				write_com(0x0f);
			}
			if(s1num==2)
			{
			
				write_com(0x80+0x40+3);	
			}
			if(s1num==3)
			{
			
				write_com(0x80+0x40);	
			}
			if(s1num==4)
			{
			
				write_com(0x80+8);	
			}
			if(s1num==5)
			{
				
				write_com(0x80+5);	
			}
			if(s1num==6)
			{
			
				write_com(0x80+0);	
			}
			
			if(s1num==7)
			{
			
				write_com(0x80+11);
		
			}
			if(s1num==8)
			{
				write_com(0x0c);
				s1num=0;
				write_a(0x80,miao/10*16+miao%10);
				
			}
		}	
	}
		if(s1num!=0)
		{
			if(s2==0)
			{
				delay(10);
				if(s2==0)
				{
					while(!s2);
					if(s1num==1)
					{
						miao++;
						if(miao==60)
							miao=0;
						write_a(0x80,miao/10*16+miao%10);
						write_sfm(6,miao);
						write_com(0x80+0x40+6);
					}
					if(s1num==2)
					{
						fen++;
						if(fen==60)
							fen=0;
						write_a(0x82,fen/10*16+fen%10);
						write_sfm(3,fen);
						write_com(0x80+0x40+3);	
					}
					if(s1num==3)
					{
						shi++;
						if(shi==24)
						shi=0;
						write_a(0x84,shi/10*16+shi%10);
						write_sfm(0,shi);
						write_com(0x80+0x40);
					}	
					if(s1num==4)
					{
						ri++;
						if(ri==(ritop+1))
							ri=1;
						write_a(0x86,ri/10*16+ri%10);
						write_yr(8,ri);
						write_com(0x80+8);
					}				
					if(s1num==5)
					{
						yue++;
						if(yue==13)
							yue=0;
						write_a(0x88,yue/10*16+yue%10);
						write_yr(5,yue);
						write_com(0x80+5);
					}
					if(s1num==6)
					{
						nian++;
						write_a(0x8c,nian/10*16+nian%10);
						write_yr(2,nian);
						write_com(0x80+2);
					}
					if(s1num==7)
					{
						week++;
						write_a(0x8a,week/10*16+week%10);
						write_week(11,week);
						write_com(0x80+0x11);
					}		
								
				}
			}
			if(s3==0)
			{
				delay(10);
				if(s3==0)
				{
					while(!s3);
					if(s1num==1)
					{
						miao--;
						if(miao==-1)
							miao=59;
						write_a(0x80,miao/10*16+miao%10);
						write_sfm(6,miao);
						write_com(0x80+0x40+6);
					}
					if(s1num==2)
					{
						fen--;
						if(fen==-1)
							fen=59;
						write_a(0x82,fen/10*16+fen%10);
						write_sfm(3,fen);
						write_com(0x80+0x40+3);	
					}
					if(s1num==3)
					{
						shi--;
						if(shi==-1)
							shi=23;
						write_a(0x84,shi/10*16+shi%10);
						write_sfm(0,shi);
						write_com(0x80+0x40);
					}	
					if(s1num==4)
					{
						ri--;
						if(ri==0)
							ri=30;
						write_a(0x86,ri/10*16+ri%10);
						write_yr(8,ri);
						write_com(0x80+8);
					}				
					if(s1num==5)
					{
						yue--;
						if(yue==0)
							yue=12;
						write_a(0x88,yue/10*16+yue%10);
						write_yr(5,yue);
						write_com(0x80+5);
					}
					if(s1num==6)
					{
						nian--;
						write_a(0x8c,nian/10*16+nian%10);
						write_yr(2,nian);
						write_com(0x80+0x02);
					}
					if(s1num==7)
					{
						week--;
						write_a(0x8a,week/10*16+week%10);
						write_week(11,week);
						write_com(0x80+11);
					}		
								
				}
			
			}

		}
}