Lpc2000

Hi,
I am using MODBUS serial communication through UART on LPC2138. My 
transmission works fine, but for some reason during reception, I never 
seem to get the RDA interrupt and always get the CTI instead. I have 
enabled only the RBR interrupt and disabled the THRE and RX line 
status interrupts. 

Anyone has faced any similar problems? Suggestions and tips are welcome

Thanks,
Swetha