com_pc-mcu

#include <REG52.H>  
 
unsigned char UART_buff;  
bit New_rec = 0,Send_ed = 1,Money = 0;  
void main (void)  
{  
    SCON = 0x50;     
    TMOD = 0x20;    
    TH1 = 0xFD;   
    TL1 = 0xFD;  
    TR1 = 1;                          
    ES  = 1;        
    EA  = 1;  
   while(Money == 0);    
    
    while(1)  
   {   
     if((New_rec == 1) && (Send_ed == 1)) 
         {  
             UART_buff = SBUF; 
            SBUF = UART_buff;   
         New_rec = 0;  
         Send_ed = 0;  
         }
   } 
}  
 
void ser_int (void) interrupt 4  
 
{  
     if(RI == 1) 
    {    
        RI = 0;      
         New_rec = 1;  
        UART_buff = SBUF;   
      if(UART_buff == ‘1‘)  Money = 1;  
            Money = 1; 
    }  
   
     else  
    {        
        TI = 0;      
         Send_ed = 1;  
    }  

}