Datasheet

MC68HC908LJ24/LK24 — Rev. 2.1 Data Sheet
Freescale Semiconductor External Interrupt (IRQ) 401
Data Sheet — MC68HC908LJ24
Section 19. External Interrupt (IRQ)
19.1 Contents
19.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401
19.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .401
19.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .402
19.4.1 IRQ Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .404
19.5 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . .405
19.6 IRQ Status and Control Register (INTSCR) . . . . . . . . . . . . . .405
19.2 Introduction
The external interrupt (IRQ) module provides a maskable interrupt input.
19.3 Features
Features of the IRQ module include the following:
• A dedicated external interrupt pin (IRQ
)
• IRQ interrupt control bits
• Hysteresis buffer
• Programmable edge-only or edge and level interrupt sensitivity
• Automatic interrupt acknowledge
• Internal pullup resistor