Overview Of The Interrupt Controller - Fujitsu FR60 Hardware Manual

CHAPTER 11 INTERRUPT CONTROLLER

11.1 Overview of the Interrupt Controller

The interrupt controller controls interrupt acceptance and arbitration processing.
■ Hardware Configuration of the Interrupt Controller
The interrupt controller consists of the following components:
• Interrupt control registers (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
• Generating a HOLD request cancellation request for the bus master
330
(to CPU)
B