MC68HC908GP20 Datasheet, PDF (185/406 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Advance Information — MC68HC908GP20
Section 12. External Interrupt (IRQ)
12.1 Contents
12.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
12.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
12.4 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .186
12.5 IRQ Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
12.6 IRQ Module During Break Interrupts . . . . . . . . . . . . . . . . . . . 189
12.7 IRQ Status and Control Register . . . . . . . . . . . . . . . . . . . . . . 189
12.2 Introduction
The IRQ (external interrupt) module provides a maskable interrupt input.
12.3 Features
Features of the IRQ module include:
• 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
MC68HC908GP20 — Rev 2.1
Freescale Semiconductor
Advance Information
185