INTERRUPT REQUEST SYSTEM

PURPOSE:To perform a delicate process by adding a simple circuit by providing a discriminating section which discriminates whether or not an interrupt request signal is to be inputted to an arithmetic processing section between a receiving section and the arithmetic processing section in a controller. CONSTITUTION:In a controller of an interrupt request system for handshake communication in which each device (200-1)-(200-n) returns response data to a communication controller 100 in response to control data sent from the controller 100, a storing section 500 stores a signal for discriminating whether or not an interrupt request signal outputted from a receiving section 300 is to be inputted to an arithmetic processing section 700 and a discriminating section 600 discriminates whether or not the interrupt request signal is to be inputted to the section 700 on the basis of the signal read out and inputted from the section 500 when the interrupt request signal is outputted from the section 300 of the controller 100. The section 700 makes interrupt processing in accordance with the discriminated result of the section 600 against the interrupt request signal which is outputted from the section 300 whenever the section receives data.