Hey,
I have a problem with my UART. It runs as long as the RS232-Cable to the PC is connected, but once I unplug it(i.e. the TxD and RxD Pins are open), the UART stops sending data. Is this a correct behaviour or am I doing something wrong?
"It runs as long as the RS232-Cable to the PC is connected, but once I unplug it(i.e. the TxD and RxD Pins are open)"
You're not connecting the microcontroller's TxD and RxD Pins direct to RS232, are you...? :-0
You do have an RS232 transceiver (eg, MAX232) between the microcontroller's Pins and the RS232, don't you...? :-0