求助ds1302在仿真上面明显走快是什么原因？

/*# DS1302代码片段说明
1. 本文件夹中提供的驱动代码供参赛选手完成程序设计参考。
2. 参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题
中对单片机时钟频率的要求，进行代码调试和修改。
*/
#include "ds1302.h"
#include "intrins.h"
sbit SCK = P1^7;
sbit SDA = P2^3;
sbit RST = P1^3;
//
void Write_Ds1302(unsigned char temp)
{
unsigned char i;
for (i=0;i<8;i++)
{
SCK = 0;
SDA = temp&0x01;
temp>>=1;
SCK=1;
}
}
//
void Write_Ds1302_Byte( unsigned char address,unsigned char dat )
{
RST=0;_nop_();
SCK=0;_nop_();
RST=1; _nop_();
Write_Ds1302(address);
Write_Ds1302(dat);
RST=0;
}
//
unsigned char Read_Ds1302_Byte ( unsigned char address )
{
unsigned char i,temp=0x00;
RST=0;_nop_();
SCK=0;_nop_();
RST=1;_nop_();
Write_Ds1302(address);
for (i=0;i<8;i++)
{
SCK=0;
temp>>=1;
if(SDA)
temp|=0x80;
SCK=1;
}
RST=0;_nop_();
SCK=0;_nop_();
SCK=1;_nop_();
SDA=0;_nop_();
SDA=1;_nop_();
return (temp);
}
void Set_Rtc(unsigned char *ucRtc)
{
unsigned char i ;
Write_Ds1302_Byte(0x8e,0x00);//关闭写保护
for( i = 0;i < 3 ; i++)
Write_Ds1302_Byte(0x84-2*i,ucRtc[lbk]i[rbk]);
Write_Ds1302_Byte(0x8e,0x80);//开启写保护
}
void Read_Rtc(unsigned char *Rtc)
{
unsigned char i ;
for( i = 0;i < 3 ; i++)
Rtc[lbk]i[rbk]=Read_Ds1302_Byte(0x85-2*i);
}
void Set_Date(unsigned char* ucDate)
{
Write_Ds1302_Byte(0x8e,0);
Write_Ds1302_Byte(0x8c,ucDate[lbk]0[rbk]);
Write_Ds1302_Byte(0x8e,ucDate[lbk]1[rbk]);
Write_Ds1302_Byte(0x8e,ucDate[lbk]2[rbk]);
Write_Ds1302_Byte(0x8e,1);
}
void Read_Date(unsigned char* ucDate)
{
ucDate[lbk]0[rbk]=Read_Ds1302_Byte(0x8d);
ucDate[lbk]1[rbk]=Read_Ds1302_Byte(0x89);
ucDate[lbk]2[rbk]=Read_Ds1302_Byte(0x87);
}
以上是底层驱动代码