M68HC08 Datasheet, PDF (171/230 Pages) Motorola, Inc – Microcontrollers

Data Sheet — MC68HC908QY4
Section 13. External Interrupt (IRQ)
13.1 Contents
13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
13.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
13.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
13.5 IRQ Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174
13.6 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . . 175
13.7 IRQ Status and Control Register . . . . . . . . . . . . . . . . . . . . . . 175
13.2 Introduction
The IRQ pin (external interrupt), shared with PTA2 (general purpose
input) and keyboard interrupt (KBI), provides a maskable interrupt input.
13.3 Features
Features of the IRQ module include the following:
• External interrupt pin, IRQ
• IRQ interrupt control bits
• Hysteresis buffer
• Programmable edge-only or edge and level interrupt sensitivity
• Automatic interrupt acknowledge
• Selectable internal pullup resistor
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
MOTOROLA
External Interrupt (IRQ)
171