INTERRUPTION CIRCUIT

PURPOSE:To prevent interruption processing from being interrupted by other interruptions and to initiate an efficient interruption by giving respective interruption requests, having equal priority and inhibiting other interruptions during interruption processing. CONSTITUTION:While a low-priority peripheral device 22 performs interruption processing, a flip-flop 33 and an OR gate 34 detect the peripheral device 22 in the act of performing the interruption processing and inhibits an interruption from a high-priority periphery device 21. Then, the transmission of the interruption inhibition to the low-priority peripheral device 22 by this peripheral device 21 through a daisy chain is cut off by a flip-flop 31 and an OR gate 32, and the interruption permission of the peripheral device 22 is held. Consequently, the interruption of the interruption processing of the peripheral device 22 by other peripheral devices is eliminated. Thus, the interruption is carried out efficiently.