DS18B20温度刚开始显示为+85度，几秒后温度正常？

请问怎么增加延时使得温度直接测量，没有+85度，并且通过按键增加/减少的温度显示正常，不延时。
代码如下：
main:
#include
#include"lcd.h"
#include"temp.h"
void LcdDisplay(int);
***it K1=P2^0;
***it K2=P2^1;
***it K3=P2^2;
***it K4=P2^3;
extern int th=20;
extern int tl=-10;
***it beep=P1^3;
/***************
蜂鸣器
*************/
void SPEAK()
{
            beep=0;
            Delay1ms(50);
            beep=1;
}
/*********
主程序
**********/
void main()
{
LcdInit();
      LcdWriteCom(0xc7);
      LcdWriteData('C');
      while(1)                               //按键扫描
      {
         if(K1==0)
         {
         Delay1ms(500);
         if(K1==0);
         th++;                               //增加温度上限
   }
         if(K2==0)
      {
         Delay1ms(500);
         if(K2==0);
         th--;                               //减小温度上限
      }
      if(K3==0)
      {
         Delay1ms(500);
         if(K3==0);
         tl++;                                  //增加温度下限
      }
      if(K4==0)
      {
         Delay1ms(500);
         if(K4==0);
         tl--;                                  //减小温度下限
      }

         LcdDisplay(Ds18b20ReadTemp());  //显示读取温度
         }
}
void LcdDisplay(int temp)
{
   int i,tt,rr,mm;
      unsigned char datas[] = {0, 0, 0, 0},datas1[] = {0, 0, 0},datas2[] = {0, 0, 0};
      float tp;
      if(temp< 0)                                        //判断温度是否为负值
      {
         LcdWriteCom(0xc0);                   //负温度，显示"-"
         LcdWriteData('-');
            i=1;
            temp=temp-1;
            temp=~temp;
            tp=temp;
            temp=tp*0.0625*10+0.5;          //将温度的高位与低位合并对结果进行4舍5入
               mm=-temp;
      }
      else
            {                                              //正温度，显示"+"
               LcdWriteCom(0xc0);
               LcdWriteData('+');
               tp=temp;
               temp=tp*0.0625*10+0.5;          //将温度的高位与低位合并对结果进行4舍5入
               mm=temp;
            }
            datas[0] = temp / 1000;                //百位
            datas[1] = temp % 1000 / 100;          //十位
            datas[2] = temp % 100 / 10;          //个位
            datas[3] = temp% 10;                            //小数位
            if(th < 0)
         {
               LcdWriteCom(0x89);
               LcdWriteData('-');
               tt=-th;
         }
            else
            {
               LcdWriteCom(0x89);
               LcdWriteData('+');
               tt=th;
            }
            datas1[0] = tt / 100;
            datas1[1] = tt% 100 / 10;
            datas1[2] = tt % 10;
            LcdWriteCom(0x87);                               //温度上限显示
            LcdWriteData('H');
            LcdWriteCom(0x88);
            LcdWriteData(':');
            LcdWriteCom(0x8a);
            LcdWriteData('0'+datas1[0]);
         LcdWriteCom(0x8b);
            LcdWriteData('0'+datas1[1]);
            LcdWriteCom(0x8c);
            LcdWriteData('0'+datas1[2]);
            if(tl < 0)
               {
                     LcdWriteCom(0x90);
                     LcdWriteData('-');
                     rr=-tl;
               }
         else
               {
                     LcdWriteCom(0x90);
                     LcdWriteData('+');
                     rr=tl;
               }
                     datas2[0] = rr / 100;
                     datas2[1] = rr% 100 / 10;
                     datas2[2] = rr % 10;
                     LcdWriteCom(0x8e);                         //温度下限显示
                     LcdWriteData('L');
                     LcdWriteCom(0x8f);
                     LcdWriteData(':');
                     LcdWriteCom(0x91);
                     LcdWriteData('0'+datas2[0]);
                     LcdWriteCom(0x92);
                     LcdWriteData('0'+datas2[1]);
                  LcdWriteCom(0x93);
                     LcdWriteData('0'+datas2[2]);

                     if(mm>=(th*10)||mm<=(tl*10)||th<=tl)
                        {
                              P0=0;
                              SPEAK();
                        }
                     else
                     {
                              P0=0xff;
                              beep=1;
                     }

                     LcdWriteCom(0x80);
                     LcdWriteData('T');
                     LcdWriteCom(0x81);
                     LcdWriteData('E');
                  LcdWriteCom(0x82);
                     LcdWriteData('M');
                     LcdWriteCom(0x83);
                     LcdWriteData('P');
                     LcdWriteCom(0x84);
                     LcdWriteData(' ');
                     LcdWriteCom(0x85);
                     LcdWriteData(' ');
                     LcdWriteCom(0xc1);
                     LcdWriteData('0'+datas[0]);
                     LcdWriteCom(0xc2);
                     LcdWriteData('0'+datas[1]);
                     LcdWriteCom(0xc3);
                     LcdWriteData('0'+datas[2]);
                     LcdWriteCom(0xc4);
                     LcdWriteData('.');
                     LcdWriteCom(0xc5);
                     LcdWriteData('0'+datas[3]);
                     LcdWriteCom(0xc6);
                     LcdWriteData('"');
                     LcdWriteCom(0xc7);
                     LcdWriteData('C');
  }
temp:

#include"temp.h"
void Delay1ms(unsigned int y) //延时1MS函数
{
unsigned int x;
for(y;y>0;y--)
for(x=110;x>0;x--);
}
unsigned char Ds18b20Init() //初始化
{
unsigned int i;
DSPORT=0;
i=70;
while(i--);
DSPORT=1;
i=0;
while(DSPORT)
{
   i++;
   if(i>5000)
   return 0;//失败
}
   return 1;//成功
}
void Ds18b20WriteByte(unsigned char dat) //写字节
{
unsigned int i,j;
for(j=0;j<8;j++)
   {
   DSPORT=0;    //每写入一位数据之前先把总线拉低1us （数据手册上模糊）
   i++;
         DSPORT=dat&0x01;
         i=6;
         while(i--);
         DSPORT=1;
         dat>>=1;
         }
}
      unsigned char Ds18b20ReadByte()
         {
         unsigned char byte,bi;
         unsigned int i,j;
               for(j=8;j>0;j--)
               {
                  DSPORT=0;
                  i++;
                  DSPORT=1;
                  i++;

         i++;
                     bi=DSPORT;
                     byte=(byte>>1)|(bi<<7);
                     i=4;
                     while(i--);
                     }
            return byte;
            }
void Ds18b20ChangTemp() //温度转换
{

      Ds18b20Init();
      Delay1ms(1);
      Ds18b20WriteByte(0xcc);
      Ds18b20WriteByte(0x44);

}
void Ds18b20ReadTempCom() //读取温度命令
{
      Ds18b20Init();
      Delay1ms(1);
      Ds18b20WriteByte(0xcc);       //跳过ROM
      Ds18b20WriteByte(0xbe);       //发送读温度命令
}
int Ds18b20ReadTemp() //读取温度
{
      int temp=0;
      unsigned char tmh,tml;
      Delay1ms(750);
      Ds18b20ChangTemp();
      Ds18b20ReadTempCom();
      tml=Ds18b20ReadByte();          //读取温度值低位
      tmh=Ds18b20ReadByte();          //读取温度值高位
      temp=tmh;
      temp<<=8;
      temp|=tml;                      //高低8位结合

return temp;
}