Abstract: An automatic computer software code generator for multirate real time control systems uses a functional library to define a multiplicity of functional blocks for building a functional description of a control system. For each functional block there is a software template for generating a set of software statements for performing one or more computations each time the software associated with that functional block is executed. A functional description of the control system software to be generated is provided in the form of a catalog database, and the computational relationships to be implemented by the software generated by the invention are defined by specified combinations of the functional blocks in the functional library. A linking software module organizes the catalog database into a plurality of separate subsystems, each subsystem including all the specified functional blocks with a given repetition rate and skew.