INTERRUPTION CONTROL SYSTEM

PROBLEM TO BE SOLVED: To prevent an interruption request from an 10 device from being kept waiting by an interruption controller. SOLUTION: The interruption controller 11 is connected to respective IO devices 21-24 by control lines 31-34, controls interruptions from the IO devices 21-24, and informs a central processor 4 of those interruptions as interruption signals. An interruption timer part 51 is connected to the control lines 31-34, counts how long the time has passed after the interruptions from the IO devices 21-24 are reported and holds their times, and the counted values can be read and written by software.