这个问题怎么解决，单片机程序keil编译出错
错误内容：error C264: intrinsic '_nop_': declaration/activation error
单片机源程序如下：
#include <reg51.h>
#include <reg51.h>
sbit LCM_RS=P3^0;
sbit LCM_RW=P3^1;
sbit LCM_EN=P3^7;
#define BUSY 0x80
#define DATAPORT P1
#define uchar unsigned char
#define uint unsigned int
#define L 50
uchar str0[16],str1[16],count;
uint speed;
unsigned long time;
void ddelay(uint);
void lcd_wait(void);
void display();
void initLCM();
void WriteCommandLCM(uchar WCLCM,uchar BusyC);
void STR();
void account();
void int0_isr(void) interrupt 0
{
unsigned int temp;
time=count;
TR0=0;
temp=TH0;
temp=((temp << 8) | TL0);
TH0=0x3c;
TL0=0xaf;
count=0;
TR0=1;
time=time*50000+temp;
}
void time0_isr(void) interrupt 1
{
TH0 =0x3c;
TL0 =0xaf;
count++;
}
void main(void)
{
TMOD=0x01;
IP|=0x01;
TCON|=0x11;
IE|=0x83;
TH0=0x3c;
TL0=0xaf;
initLCM();
WriteCommandLCM(0x01,1);
for(;;)
{
account();
display();
}
}
void account()
{
unsigned long a;
if (time!=0)
{
a=L*360000000/time;
}
speed=a;
}
void STR()
{
str0[0]='S';
str0[1]='p';
str0[2]='e';
str0[3]='e';
str0[4]='d';
str0[5]=' ';
str0[6]=(speed%100000)/10000+0x30;
str0[7]=(speed%10000)/1000+0x30;
str0[8]=(speed%1000)/100+0x30;
str0[9]='.';
str0[10]=(speed%100)/10+0x30;
str0[11]=speed%10+0x30;
str0[12]='k';
str0[13]='m';
str0[14]='/';
str0[15]='h';
}
void ddelay(uint k)
{
uint i,j;
for(i=0;i<k;i++)
{
for(j=0;j<60;j++)
{;}
}
}
void WriteCommandLCM(uchar WCLCM,uchar BusyC)
{
if(BusyC)lcd_wait();
DATAPORT=WCLCM;
LCM_RS=0;
LCM_RW=0;
LCM_EN=1;
_nop_();
_nop_();
_nop_();
LCM_EN=0;
}
void WriteDataLCM(uchar WDLCM)
{
lcd_wait( );
DATAPORT=WDLCM;
LCM_RS=1;
LCM_RW=0;
LCM_EN=1;
_nop_();
_nop_();
_nop_();
LCM_EN=0;
}
void lcd_wait(void)
{
DATAPORT=0xff;
LCM_EN=1;
LCM_RS=0;
LCM_RW=1;
_nop_();
_nop_();
_nop_();
while(DATAPORT&BUSY)
{ LCM_EN=0;
_nop_();
_nop_();
LCM_EN=1;
_nop_();
_nop_();
}
LCM_EN=0;
}
void initLCM( )
{
DATAPORT=0;
ddelay(15);
WriteCommandLCM(0x38,0);
ddelay(5);
WriteCommandLCM(0x38,0);
ddelay(5);
WriteCommandLCM(0x38,0);
ddelay(5);
WriteCommandLCM(0x38,1);
WriteCommandLCM(0x08,1);
WriteCommandLCM(0x01,1);
WriteCommandLCM(0x06,1);
WriteCommandLCM(0x0c,1);
}
void DisplayOneChar(uchar X,uchar Y,uchar DData)
{
Y&=1;
X&=15;
if(Y)X|=0x40;
X|=0x80;
WriteCommandLCM(X,0);
WriteDataLCM(DData);
}
void DisplayListChar(uchar X,uchar Y,uchar *DData)
{
uchar ListLength=0;
Y&=0x01;
X&=0x0f;
while(X<16)
{
DisplayOneChar(X,Y,DData[ListLength]);
ListLength++;
X++;
}
}
void display()
{
STR();
DisplayListChar(0,0,str0);
DisplayListChar(0,1,str1);
}
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