How to accomplish pin sharing to make SWDCLK pin as UART TX pin

[#1]

I'm working with XMC1100-T016X0016. Due to limited amount of pins, I'm having to use P0.15 as both SWDCLK_0 and UART_TXD. After flashing the code, I would want that pin to start working as a TXD pin for UART. Is there an Application Note somewhere that describes how to accomplish this?

[#2]

Sorry. Wrong place. I reposted my question in the appropriate section. Please delete this thread.