MC68HC705J1ACPE Datasheet, PDF (101/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc.

Freescale Semiconductor, Inc.
Technical Data — MC68HC705J1A
Section 8. External Interrupt Module (IRQ)
8.1 Contents
8.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
8.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.3.1
8.3.2
IRQ/V_PP Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Optional External Interrupts . . . . . . . . . . . . . . . . . . . . . . . . 104
8.4 IRQ Status and Control Register . . . . . . . . . . . . . . . . . . . . . . 106
8.5 External Interrupt Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.5.1 5.0-Volt External Interrupt Timing Characteristics . . . . . . . 107
8.5.2 3.3-Volt External Interrupt Timing Characteristics . . . . . . . 107
8.2 Introduction
The external interrupt (IRQ) module provides asynchronous external
interrupts to the CPU. These sources can generate external interrupts:
• IRQ/V_PP pin
• PA0–PA3 pins
Features include:
• Dedicated external interrupt pin (IRQ/V_PP)
• Selectable interrupt on four input/output (I/O) pins (PA0–PA3)
• Programmable edge-only or edge- and level-interrupt sensitivity
MC68HC705J1A — Rev. 4.0
External Interrupt Module (IRQ)
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Technical Data