Overview Of The Interrupt Controller - Fujitsu FR60 Hardware Manual

CHAPTER 9 INTERRUPT CONTROLLER
9.1

Overview of the Interrupt Controller

The interrupt controller controls interrupt acceptance and arbitration processing.
■ Hardware Configuration of the Interrupt Controller
The interrupt controller module consists of the following components:
• ICR register
• Interrupt priority decision circuit
• Interrupt level and interrupt number (vector) generator
• HOLD request cancellation request generator
■ Major Functions of the Interrupt Controller
The interrupt controller has the following major functions:
• Detecting NMI requests and interrupt requests
• Deciding priority (using a level or number)
• Passing to the CPU an interrupt level based on the decision result to provide information about the
interrupt source
• Passing to the CPU an interrupt number based on the decision result to provide information about the
interrupt source
• Instruction for return from stop mode due to the occurrence of an interrupt with an NMI/interrupt level
other than 11111 (to CPU)
• Generating a HOLD request cancellation request for the bus master
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