INTERRUPTION CONTROL SYSTEM

PURPOSE:To prevent the loss of interval timer interruption. CONSTITUTION:In this interruption control system, an interruption control part 303 receives an interruption signal generated at specified periods from a timer circuit 301 and a general interruption signal, a processor 307 interrupt-processes from an interruption request from the interruption control part and vector data, and at the time of generating another interruption while this processing, the interruption control part holds the interruption state for one time for each interruption signal. In the interruption control system, an interruption state holding circuit 304 stores and holds the generation of an interval timer interruption signal and an NMI information circuit 305 NMI-informs the processor with a second interval timer interruption signal so as to execute an interval timer interruption processing. A vector decoder circuit 306 releases the states of the interruption state holding circuit and the NMI information circuit when the interval timer interruption processing is finished.