Abstract: This paper presents a study on the designing of MCU and its interface modules circuits. The function of Stepper motor, DC motor and the AC motor speed control and display can be achieved by the circuit after the circuit was processed by MCU through the keyboard to input the motor values. In the aspect of the hardware and software, the composition and the overall program on the platform of the interface control tests were introduced . The diagram of the hardware and software was also described in detail and the functional components based on analysis of the functional components of the modules were selected by comparison with others. Besides, according to the general requirements, the functions of software and hardware modules were divided. Software and hardware joint debugging, In order to implement the function of input speed display, speed control, the actual speed of AC motor display.
Keywords: MCU; Motor control; Inverter speed display; Unit Interface circuit