Datasheet

MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3 Technical Data
Freescale Semiconductor External Interrupt (IRQ) 219
Technical Data — MC68HC908JB8•MC68HC08JB8•MC68HC08JT8
Section 13. External Interrupt (IRQ)
13.1 Contents
13.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219
13.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .219
13.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
13.5 IRQ Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222
13.6 PTE4/D– Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223
13.7 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . .223
13.8 IRQ Status and Control Register . . . . . . . . . . . . . . . . . . . . . .224
13.9 IRQ Option Control Register. . . . . . . . . . . . . . . . . . . . . . . . . .225
13.2 Introduction
The IRQ module provides two external interrupt inputs: one dedicated
IRQ pin and one shared port pin, PTE4/D–.
13.3 Features
Features of the IRQ module include:
• Two external interrupt pins, IRQ
(5V) and PTE4/D– (5V)
•IRQ interrupt control bits
• Hysteresis buffer
• Programmable edge-only or edge and level interrupt sensitivity
• Automatic interrupt acknowledge
• Low leakage IRQ pin for external RC wake up input
• Selectable internal pullup resistor