Data processor with means for separately receiving and processing different types of interrupts

A data processor, comprising:

• first interrupt requesting means for informing a first interrupt request which is generated on the basis of a first interrupt factor and requests activation of a first interrupt processing;
• second interrupt requesting means for informing a second interrupt request which is generated on the basis of a second interrupt factor and requests activation of a second interrupt processing;
• third interrupt requesting means for informing a third interrupt request which is generated on the basis of a third interrupt factor and requests activation of a third interrupt processing;
• instruction executing means for executing said first, second and third interrupt processings;
• controlling means for receiving said first, second and third interrupt requests, and for activating execution of said interrupt processing corresponding to respective received interrupt request done by said instruction executing means;
• and
• storing means for storing two statuses;
• either the enabling status where said controlling means receives an interrupt request or the prohibiting status where said controlling means does not receive an interrupt request;
• wherein said controlling means
• when said storing means stores the prohibiting status, does not activate any of said first, second and third interrupt processings,
• when said storing means stores the enabling status, and said first interrupt request is generated, makes said storing means store the prohibiting status and activates said first interrupt processing regardless of the presence or absence of the generation of said second interrupt request and said third interrupt request,
• when said storing means stores the enabling status, and said first, interrupt request is not generated and said second interrupt request is generated, makes said storing means store the prohibiting status and activates said second interrupt processing regardless of the presence or absence of the generation of said third interrupt request, and
• when said storing means stores the enabling status, and both said first interrupt request and said second interrupt request are not generated, and said third interrupt request is generated, makes said storing means hold the enabling status and activates said third interrupt processing.