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Section 8 Interrupt Controller (INTC)
8.1
Overview
The Intelligent Peripheral Controller interrupts are issued from the modules of PS/2, PCMCIA,
AFE, GPIO port, Timer, Keyboard Controller, IrDA , UART, PP, SCDI, USB, and ADC. The
controller contains a register for the interrupt request status issued from each module.
After SH-4/SH7709 detects the interrupt, it reads the interrupt request register to see which module
generates the interrupt, and then reads the interrupt request register in each module. As the
controller provides the feature of gathering interrupts from all modules into one register, it will
help to simplify the CPU interrupt processing.
8.1.1
Features
•
All interrupts issued from the internal modules are gathered into one register
•
Only one external interrupt output pin IRQ0# is used to request the interrupt service
•
Interrupt request lines from each module are high active and level trigger signals
•
The priority order of interrupt request lines is determined by software
•
Each module provides an interrupt mask bit. A mask register, which is able to perform masking
for each module interrupt, is also included
Summary of Contents for HD64465
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