A method for controlling task processes using a minimum of energy. The task processes are divided into two or more groups in accordance with an execution priority. The individual task processes within each group are further prioritized with respect to each other. The method is driven by repetitive processing cycles. During each processing cycle, the highest priority task of the highest priority group is selected and executed. The method assumes a sleep or low power drain state in response to the completion of the execution of a selected task process or when no task process is available for processing and is returned to an operational state in response to the next processing cycle. The task process of the lower priority groups are selected at a longer execution cycle rate which are an integer multiple of the processing cycles.