I have the problem that my RS232 always is sending data to the PC

--- Quote Start ---

This is correct, according to your code. Infact you assert 'start' periodically when clockdiv==0.

--- Quote End ---

Thank you Cris72 I also was born in 72. For now my plan is to write a book about the Chinese module A-C8V4 that uses a Cyclone II chip.

I am going through all examples and for now I do not have an idea what I could program here. Surely start is always called when clockdiv==0.