What is control bus in microprocessor? All Questions › Category: Automotive Electronics › What is control bus in microprocessor? 0 Vote Up Vote Down chetan shidling asked 4 years ago I need short information. 2 Answers 0 Vote Up Vote Down chetan shidling answered 4 years ago The control bus as the name indicates allows the microprocessor in the main, to control the rest of the system. 0 Vote Up Vote Down chetan shidling answered 4 years ago The control bus may have up to 20 lines but has four main control signals. These are read, write, input/output request and memory request.