please check this code. i send a data (characters)from hyperterminal. but microcontroller didnt response. data sending from microcontroler to pc is done but still problem in receiving.
(i have used 8051 developement kit. so i think there is no problem in hardware.)

please help me in this topic.

#include <reg51.h>
void main(void)
{
unsigned char my_byte;
TMOD=0x20; //use Timer 1, mode 2
TH1=0xFD; //9600 baud rate
SCON=0x50;
TR1=1; /start timer
while (1) //repeat forever
{
while (RI==0); //wait to receive
my_byte=SBUF; //save value
P1=mybyte; //write value to port
RI=0;
}
}