Controller for use as parking aid in motor vehicle, comprises microprocessor and interfaces for sensor and for output units, where microprocessor processes and communicates data through interfaces, which are synchronized by ring oscillator

摘要

The controller (1) comprises a microprocessor (2) and interfaces (14,15,16,17,28,30) for a sensor (18,19,20,21) and for output units (29,31). The microprocessor processes and communicates data through the interfaces, which is synchronized by an internal ring oscillator (4) of the microprocessor. The microprocessor generates an electronic signal for controlling loudspeaker for the sound generation, such that the frequency of the generated sound signal is influenced from the resonant frequency of the ring oscillator. The microprocessor has a time measuring unit (5). An independent claim is also included for a method for operating controller with a microprocessor.