MC68HC08AZ16 Datasheet, PDF (162/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

External Interrupt Module (IRQ)
IRQ
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
IRQ1I pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
IRQ module during break interrupts . . . . . . . . . . . . . . . . . . . . . . . . . 166
IRQ status and control register (ISCR) . . . . . . . . . . . . . . . . . . . . . . . 166
Introduction
The IRQ module provides the nonmaskable interrupt input.
Features
Features of the IRQ module include the following:
• Dedicated external interrupt pins (IRQ1)
• IRQ1 interrupt control bit
• Hysteresis buffer
• Programmable edge-only or edge and level interrupt sensitivity
• Automatic interrupt acknowledge
1-irq
MOTOROLA
External Interrupt Module (IRQ)
MC68HC08AZ32
161