Abstract: A microcontroller system and a method of configuring a microcontroller system is provided. The microcontroller system comprises a central processing unit, memory associated with the microcontroller system, event receiving means operable to receive an event, and configuration control means. The configuration control means is operable to collect one or a plurality of sets of configuration data from said memory, each of said sets of configuration data defining a configuration related to at least one operational unit of the microcontroller system, wherein said sets of configuration data are associated with a first operation mode associated with the microcontroller system. Moreover, the configuration control means is operable to determine a set of configuration data of the sets of configuration data and to configure the microcontroller system corresponding to said determined set of configuration data.