A data processing control unit for controlling two or more data processing operations SMI1,SMI2. The data processing control unit may include a control memory in control data may be stored which represents information about access to a main memory by the two or more data processing operations. A control data controller may be connected to the control memory. The control data controller may include a control data controller input or receiving an access request from one or more of the data processing operations. The control data controller may modify the data in the control memory upon receiving the access request. A process controller may be connected to the control memory. The process controller may control at least a part of the data processing operations SMI1.SMI2 based on a comparison of data in the control memory with a criterion. The process controller may include a process controller input for receiving the access request; and a process controller output for outputting a process control signal based on the comparison.