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Section 5 Interrupt Controller
5.1
Overview
5.1.1
Features
The interrupt controller has the following features:
•
Interrupt priority registers (IPRs) for setting interrupt priorities
Interrupts other than NMI can be assigned to two priority levels on a module-by-module basis
in interrupt priority registers A and B (IPRA and IPRB).
•
Three-level enabling/disabling by the I and UI bits in the CPU’s condition code register (CCR)
and the UE bit in the system control register (SYSCR)
•
Seven external interrupt pins
NMI has the highest priority and is always accepted; either the rising or falling edge can be
selected. For each of IRQ
5
to IRQ
0
, sensing of the falling edge or level sensing can be selected
independently.
Summary of Contents for H8/3008
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