Datasheet

MC68HC908LJ12 — Rev. 2.1 Technical Data
Freescale Semiconductor External Interrupt (IRQ) 357
Technical Data — MC68HC908LJ12
Section 18. External Interrupt (IRQ)
18.1 Contents
18.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .357
18.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .357
18.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .358
18.4.1 IRQ Pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .360
18.5 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . .361
18.6 IRQ Status and Control Register (INTSCR) . . . . . . . . . . . . . .361
18.2 Introduction
The external interrupt (IRQ) module provides a maskable interrupt input.
18.3 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