Hello,

I do not think it is language, here is my sample code


int com_initialize()
{
// 1. Init serial port
EA = 0; // disable global interrupt mask
SCON1 = 0x50; // set SCI_1 to 8N1, RX enabled
SCON0 = 0x50; // set SCI_0 to 8N1, RX enabled
TMOD |= 0x21; // set timer 1 as Mode 2 and timer 0 as mode 1
TH1 = 0xF7; // 4800 baud rate 16.384 MHz crystal for serial port 1
TR1 = 1; // enable Timer 1
TR0 = 0;
T2CON = 0x30; // use timer2 for serial port 0 baud rate generation, both send snd receive uses timer2
RCAP2H = 0xFF;
RCAP2L = 0x95; // 4800 baud rate for 16.384 MHz crystal
TR_2 = 1; // enable timer 2
ES0 = 1; // Enable Interrupts for SCI_0
ES1 = 1; // Enable Interrupts for SCI_1
// ET0 = 1; // enable timer 0 interrupt
EA = 1; // enable global interrupt mask
// 2. Initiate SCI_1 Tx

TI_0 = 1 ;
TI_1 = 1;
return 0;

}

here is my interrupt service routine

void sci1ISR (void) interrupt 7 reentrant
{
ES1=0;
if ( RI_1) {
gps_data[gps_in] = SBUF1 ;
RI_1 = 0;
gps_in = gps_in + 1;
if ( gps_in == GPS_DATA_SIZE ) {
buffer_filled = 1;
gps_in = 0;
}

}
ES1=1;
#if 0
else if ( TI_1 ) {

SBUF1 = n ;
TI_1 = 0;


}

#endif



}

I am using hardware ( evaluation kit "HSM40 Microcontroller eval kit" from Dallas semiconductor now www.maxim-ic.com , crystal is 16.384 MHz ) designed and developed by Dallas semiconductor
serial port 0 works ( my serial port ISR is similar to serial port 1 ISR )
-Thanks
-Alok Kumar Mishra