Motorola MC68HC908AB32 - Contents; Features; Introduction; Section 18. External Interrupt (IRQ)

MC68HC908AB32 — Rev. 1.0 Technical Data
MOTOROLA External Interrupt (IRQ) 339
Technical Data — MC68HC908AB32
Section 18. External Interrupt (IRQ)
18.1 Contents
18.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .339
18.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .339
18.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .340
18.4.1 IRQ
Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .342
18.5 IRQ Status and Control Register (ISCR) . . . . . . . . . . . . . . . .343
18.6 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . .344
18.2 Introduction
The IRQ (external interrupt) module provides a maskable interrupt input.
18.3 Features
Features of the IRQ module include the following:
• A dedicated external interrupt pin, I
RQ
• IRQ interrupt control bits
• Hysteresis buffer
• Programmable edge-only or edge and level interrupt sensitivity
• Automatic interrupt acknowledge
• Internal pullup resistor