hello ,
I am serious about what I am asking you.
I am asking you because I didnt get required solution.
Any way I ma using atmel's AT89C5122 controller


I just want to receive a character from hyper terminal

then interrupt occures there I ma glowing one LED of my development board.

please suggest me where am I going wrong.

and my code is





//***************************************************

#include "AT8XC5122.h"
#include "EXT5122.H"

void delay() //10 msec
{
int xdata m,n;
for(n=0;n<4;n++)
for(m=0;m<600;m++);
}

//****************************************************
void transmit_byte(unsigned char me)
{

SBUF=me;
if(TI==1)
{
LED5 = 0;
}
delay();

TI=0;

}
//*****************************************************

void receive(void) interrupt IRQ_UART
{

RI=0;
LED1 =0;
transmit_byte('S');

}


main()
{

SCON = 0x50;
TMOD |= 0x20;
EA=1;
//ES=1;
TH1 = 0xf7; /* TH1: reload value for 2400 baud */
TR1 = 1;
TI = 1; /* TI: set TI to send first char of UART */

//transmit_byte('S');

}