#include <STC89C5xRC.H>
int main()
{
char buf;
TMOD = 0x21; //Set the working mode of timer1
SCON = 0x50; //Set serial communication format
TH1 = 0xE6; //Set the initial value of timer1
TL1 = 0xE6;
TR1 = 1; //Start timer1
while(1)
{
if(RI == 1)
{
//If data is received
buf = SBUF;
RI = 0;
SBUF = buf; //Send the received data back
while(TI == 0); //Wait for data to be sent
IF = 0;
}
}
return 0;
}
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