Method for controlling a data transfer on a serial transmission data transfer bus by means of a central processing unit and associated system. The method includes various steps, including determining an available bandwidth for a data bus, determining an available computing capacity percentage of the central processing unit, and determining a maximum data rate that a data transfer can be performed on the data bus based on the available bandwidth and the available computing capacity percentage. Furthermore, the method provides that the data transfer rate is controlled to not exceed the maximum data rate.