microvision3 simulator...plzzzzz help..

hi.. i m using the simultors of uvision3 for debugging the applcn written for STR9, an ARM9 based ucntrlr. the problem that i m facing is that during UART commncn when i give i/p to UART through SxIN cmmnd, interrupt handler is called just once, next time i try to send another byte UART receive intrrpt handler is not called..i hv ckd the status of each flag, bt unable to found anythng relevant...FIFO is disabled...plZZZZZZZZZZZZZZ help...i need it urgently..
moreover i m not able to give i/p to UART through uvision serial windows..

can you paste the code? its not problem with uvision.

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