systemjnitial(void) 					
{
TMOD=0x21; 						
PCON=0x00;						
SCON=0x58;						
ES=1 ;							
PS=1;							
TH1=0x0E8;						
TL1=Ox0E8;						
TRl=1;							
EA=1;							
}
//68H Address Control DataLen Datal Data2…DataN SumCheck 16H
corn isp(void) interrupt 4 using 3			
{
if(RI)								
{
RI=0;							
if(b-validFrame)						
{
return;
}								
if(m-frameStatus==0x00)				
{
if(SBUF!=0x68)						
{
m-frameStatus=0x00;					
}
else
{
m-frameStatus=0x01;					
}
}
else if(m-frameStatus=0x01)			
{
m-addrCode=SBUF;					
m-frameStatus=0x02;					
m-sysCheckData=0x00;				
}
else if(mLframeStatus==0x02)			
{
m-controlCode=SBUF;				
m-frameStatus=0x03;					
m-sysCheckData+=m-controlCode;		
}
else if(m-frameStatus=== 0x03)			
{
m-dataLen=SBUF;					
m-fxameStatus=0x04;					
m-sysCheckData+=rn-dataLen;			
m-dataFieldCount=0x00;				
}
else if(m-frameStatus～0x04)			
{
m-dataBuffer[m-dataFieldCount]=SBUF;
m-sysCheckData+=m-dataBuffer[m-dataFieldCount];
m-dataFieldCount#;					
if(m-dataFieldCount==m-dataLen)	
{
m-frameStatus=0x05;					
}
}
else if(m-frameStatus==0x05)			
{
m-checkData=SBUF;					
if(m-sysCheckData != m-checkData)		
{
m-fcameStatus=0x00;					
}
else								
{
m-frameStatus=0x06;					
}
}
else if(m-frameStatus=0x06)			
{
m-frameEnd=SBUFs					
if(m-frameEnd!=0x16)				
{
b-validFrame=0;						
}
else								
{
b-validFratne=1;						  
}								
m-frameStatus=0x00;					
}
}