LPC2129, How to use PWM and UART at same time?

MCB2100
LPC2129

Hi,
I have a big problem, I have build an IR data transmitter. How can I realize a 38khz PWM single edge with UARTx at the same time? Hardware works great but the software I have made allows only PWM or UART. I have found nothing,>>> sleepless. Could someone help me. Thanks in advanced.

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