MCU hexadecimal to decimal conversion program

 //==========================================================
     //Hexadecimal to decimal output subroutine: display data, start bit, end bit, whether there is a decimal point
 //==============================================================
 void output(unsigned long dd,unsigned char s,unsigned char
 e,unsigned char dip) {
     unsigned long div;
     unsigned char tm[8],i,j;
     div=10000000;
     for (i=0;i<8;i++) {
         tm[i]=dd/div;
         dd%=div;
         div/=10;
     }
     for (i=0;i<6;i++) {
         if (tm[i]!=0) break;
         tm[i]=nul;
     }
     tm[5]|=dip; //Decimal point control, please refer to "Serial LED Digital Tube Display Driver"
     j=7;
     for (i=s;i         d[i]=tm[j];
         j--;
     }
 }

 //Convert the decimal number of display digits 5-9 into hexadecimal number
 unsigned int input(void) {
     unsigned int dd,dat;
     dd=10000;dat=0;
     for (i=5;i<10;i++) {
         dat+=dd*temp;
         dd/=10;
     }
     return(dat);
 }
 /* 89C51 series CPU programmer receives CPU program*/

 ＃i nclude
 ＃i nclude
 ＃i nclude

 #define e 8
 #define p 9
 #define l 10

 sbit led=P3^2;
 sbit p27=P2^7;
 sbit p26=P2^6;
 sbit p36=P3^6;
 sbit p37=P3^7;
 sbit rst=P3^3;
 sbit ale=P3^5;
 sbit vpp=P3^4;

 bit b_break;
 unsigned int adds;

 //    13.8mS
 void int_t0(void) interrupt 1 {
     TH0=-100;
     b_break=1;
 }

 void wait(unsigned char w) {
     unsigned int t=w*184;
     b_break=0;
     TL0=-t%256-1;TH0=-t/256;
     while (b_break==0) {}
 }

 void nop(void) {
     _nop_();_nop_();_nop_();_nop_();
     _nop_();_nop_();_nop_();_nop_();
     _nop_();_nop_();_nop_();_nop_();
     _nop_();_nop_();_nop_();_nop_();
     _nop_();_nop_();_nop_();_nop_();
 }

 unsigned char command(void) {
     TH0=-100;b_break=0;
     while (RI==0) {if (b_break==1) return(0);}
     RI=0;
     return(SBUF);
 }

 void earsure(unsigned char cpu) {
     switch (cpu) {
     case 1:        //89C51
     case 2:rst=p26=1;p27=p36=p37=0;nop();vpp=1;nop();
         ale=0;wait(110);ale=1;nop();
         break;
     case 3:
     case 4:break;
     case 5:
     case 6:break;
     }
 }

 void program(unsigned char cpu) {
     unsigned int bdata adds=0;
     unsigned char d;
     switch (cpu) {
     case 1:    //89C51
     case 2:
         p36=p37=1;rst=1;
         while (1) {
             TH0=-100;b_break=0;
             while (RI==0) {if (b_break==1) return;}
             RI=0;
             d=SBUF;
             //address
             P0=adds%256;
             P2=adds/256;
             p27=1;
             //data
             P1=d;
             nop();    //48clcl
             //vpp
             vpp=1;
             nop();    //48clcl
             //ale
             ale=0;
             wait(1);//100uS
             ale=1;
             nop();    //10uS
             vpp=0;
             nop();    //48clcl
             p27=0;
             nop();    //48clcl
             P1=0xff;
             TH0=-100;b_break=0;
             while (d!=P1) {if (b_break==1) return;}    //data
polling
             SBUF=d;
             adds++;
         }
         break;
     case 3:
     case 4:
     case 5:
     case 6:break;
     }
 }

 void lock(unsigned char cpu) {
     unsigned char i;
     switch (cpu) {
     case 1:    //89c51
     case 2:
         //lock 1
         rst=p26=p36=p27=p37=1;nop();
         vpp=1;
         nop();
         ale=0;
     //    for (i=0;i<6;i++) wait(100);
         wait(1);
         ale=1;
         nop();
         vpp=0;
         nop();
    
         //lock 2
         rst=p26=p27=1;p36=p37=0;nop();
         vpp=1;
         nop();
         ale=0;
     //    for (i=0;i<6;i++) wait(100);
         wait(1);
         ale=1;
         nop();
         vpp=0;
         nop();
        
         //lock 3
         rst=p26=p36=1;p27=p37=0;nop();
         vpp=1;
         nop();
         ale=0;
     //    for (i=0;i<6;i++) wait(100);
         wait(1);
         ale=1;
         nop();
         vpp=0;
         nop();
         break;
     case 3:
     case 4:
     case 5:
     case 6:break;
     }
 }

 void main(void) {
     unsigned char disp,flash,temp,cpu;
     EA=1;
     SCON=0xd8;PCON=0x80;
     TMOD=0x21;
     TL1=TH1=0xff;TR1=1;
     TH0=-100;ET0=TR0=1;

     flash=0x80;

     while (1) {
         temp=command();
         switch (temp) {
         case 0:
         case 1:        //89c51
         case 2:        //89C52
         case 3:        //80f51
         case 4:        //80F52
         case 5:        //87F51
         case 6:cpu=temp;SBUF=temp;break;//87f52
         case e:SBUF=temp;earsure(cpu);break;    //erasure
         case p:SBUF=temp;program(cpu);break;    //program
         case l:lock(cpu);SBUF=temp;break;    //lock
         default:SBUF=temp;break;
         }
         b_break=0;
         if ((++disp)>flash) {disp=0;led=!led;}
     }
 }
 //HT1380实时时钟驱动程序

 sbit clock_dat=P0^1;
 sbit clock_clk=P0^2;
 sbit clock_rst=P0^3;

 sbit a0=ACC^0;
 sbit a1=ACC^1;
 sbit a2=ACC^2;
 sbit a3=ACC^3;
 sbit a4=ACC^4;
 sbit a5=ACC^5;
 sbit a6=ACC^6;
 sbit a7=ACC^7;

 void clock_out(unsigned char dd) {
     ACC=dd;
     clock_dat=a0;clock_clk=1;clock_clk=0;
     clock_dat=a1;clock_clk=1;clock_clk=0;
     clock_dat=a2;clock_clk=1;clock_clk=0;
     clock_dat=a3;clock_clk=1;clock_clk=0;
     clock_dat=a4;clock_clk=1;clock_clk=0;
     clock_dat=a5;clock_clk=1;clock_clk=0;
     clock_dat=a6;clock_clk=1;clock_clk=0;
     clock_dat=a7;clock_clk=1;clock_clk=0;
 }
 unsigned char clock_in(void) {
     clock_dat=1;
     a0=clock_dat;
     clock_clk=1;clock_clk=0;a1=clock_dat;
     clock_clk=1;clock_clk=0;a2=clock_dat;
     clock_clk=1;clock_clk=0;a3=clock_dat;
     clock_clk=1;clock_clk=0;a4=clock_dat;
     clock_clk=1;clock_clk=0;a5=clock_dat;
     clock_clk=1;clock_clk=0;a6=clock_dat;
     clock_clk=1;clock_clk=0;a7=clock_dat;
     return(ACC);
 }
 unsigned char read_clock(unsigned char ord) {
     unsigned char dd=0;
     clock_clk=0;
     clock_rst=0;
     clock_rst=1;
     clock_out(ord);
     dd=clock_in();
     clock_rst=0;
     clock_clk=1;
     return(dd);
 }
 void write_clock(unsigned char ord,unsigned char dd) {
     clock_clk=0;
     clock_rst=0;
     clock_rst=1;