Hallo, I tried to use a simple "Hello World!" program to write a message on the serial port of my Infineon SAB C167CR-LM Microcontroller. I use the standart putchar-function of the Keil-Compiler to write the message to the serial port. But if I use the printf-function the controller hangs (endless output) after the first character of the string. The putchar function works fine. Kind regards Alexander Kirsch