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CHAPTER 8 INTERRUPT CONTROLLER
8.1 Overview of Interrupt Controller
The interrupt controller accepts interrupts and performs arbitration over them.
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Interrupt Controller Hardware Configuration
The interrupt controller consists of the following:
• ICR register
• Interrupt priority check circuit
• Interrupt level and number (vector) generator
• Hold request cancel request generator
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Major Interrupt Controller Functions
The major functions of the interrupt controller are as follows:
• Detection of NMI/interrupt requests
• Priority check (based on the level or number)
• Transmission of the interrupt level of the cause selected as the result of checking (to the
CPU)
• Transmission of the interrupt number of the cause selected as the result of checking (to the
CPU)
• Indication of return from stop state in accordance with NMI/interrupt
• Issuance of a hold request cancel request to the bus master