A circuit for controlling a microscope using a controller includes a slow memory configured to store control information. The controller is configured to control microscope parameters based on the control information. The circuit includes a data loader and at least two fast memories. The data loader is configured such that control information is written from the slow memory alternately into one of the at least two fast memories. The circuit also includes a multiplexer configured to permit access by the controller to one of the at least two fast memories in alternating fashion so as to read control information. The data loader is configured to control the multiplexer in such a way that a write operation by the data loader and a read operation by the controller will not occur simultaneously on the same fast memory.