2.c

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#include<reg52.h>
#define uint unsigned int 
#define uchar unsigned char
uint m,n,t,j,k,flag1,i;
sbit dula=P2^6;
sbit wela=P2^7;
sbit lcden=P3^4;
sbit rs=P3^5;
sbit wr=P3^6;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                        0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

uchar code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,
                        0x87,0xff,0xef,0xf7,0xfc,0x39,0x5e,0x79,0x71};

void delay()
{
  for(j=10;j>0;j--)
    for(k=10;k>0;k--);
}

void display(uint m,uint n,uint t)
		{
			P0=table1[m];
			dula=1;
         dula=0;
         P0=0xfe;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
		
			P0=table[n];
			dula=1;
         dula=0;
         P0=0xfd;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
		
			P0=table[t];
			dula=1;
         dula=0;
         P0=0xfb;
         wela=1;
         wela=0;
			delay();
			P0=0xff;
         wela=1;
         wela=0;
				
		}

void main()
		{
			lcden=1;
			rs=1;
			wr=1;
			TMOD=0x01;
			EA=1;
			ET0=1;
			TH0=0xdc;
			TL0=0x00;
			TR0=1;
			while(1)
				{
							if(lcden==0)
								{
									while(rs==1&&wr==1)	
										{
											TR0=0;
											display(m,n,t);
										}
								}
							if(rs==0)
								{
									while(lcden==1&&wr==1)	
										{
											TR0=1;
											display(m,n,t);
											if(flag1==1)
													{
														t++;
														flag1=0;
														if(t==10) {t=0;n++;}
														if(n==10) {n=0;m++;}
														if(m==10)  {m=0;}
														for(i=0;i<=2;i++)
															{display(m,n,t);}
													}
											}
								}
							while(wr==0)
								{
									display(m,n,t);
									m=0;
									n=0;
									t=0;
								}
							TR0=1;
							if(flag1==1)
								{
									t++;
									flag1=0;
									if(t==10) {t=0;n++;}
									if(n==10) {n=0;m++;}
									if(m==10)  {m=0;}
									for(i=0;i<=2;i++)
										{display(m,n,t);}
								}
				}
		}
void inter(void) interrupt 1 using 1
		{
		
			TH0=0xdc;
			TL0=0x00;
			flag1=1;
	
		}