参数资料
型号: MC68HC08QY4CDWE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封装: 1.27 MM PITCH, LEAD FREE, PLASTIC, MS-013AA, SOIC-16
文件页数: 148/178页
文件大小: 2311K
代理商: MC68HC08QY4CDWE
MC68HC08QY/QT Family Data Sheet, Rev. 1
Freescale Semiconductor
71
Chapter 8
External Interrupt (IRQ)
8.1 Introduction
The IRQ (external interrupt) module provides a maskable interrupt input.
IRQ functionality is enabled by setting configuration register 2 (CONFIG2) IRQEN bit accordingly. A zero
disables the IRQ function and IRQ will assume the other shared functionalities. A one enables the IRQ
function. See Chapter 5 Configuration Register (CONFIG) for more information on enabling the IRQ pin.
The IRQ pin shares its pin with general-purpose input/output (I/O) port pins. See Figure 8-1 for port
location of this shared pin.
8.2 Features
Features of the IRQ module include:
A dedicated external interrupt pin IRQ
IRQ interrupt control bits
Programmable edge-only or edge and level interrupt sensitivity
Automatic interrupt acknowledge
Internal pullup device
8.3 Functional Description
A low level applied to the external interrupt request (IRQ) pin can latch a CPU interrupt request. Figure 8-2
shows the structure of the IRQ module.
Interrupt signals on the IRQ pin are latched into the IRQ latch. The IRQ latch remains set until one of the
following actions occurs:
IRQ vector fetch. An IRQ vector fetch automatically generates an interrupt acknowledge signal that
clears the latch that caused the vector fetch.
Software clear. Software can clear the IRQ latch by writing a 1 to the ACK bit in the interrupt status
and control register (INTSCR).
Reset. A reset automatically clears the IRQ latch.
The external IRQ pin is falling edge sensitive out of reset and is software-configurable to be either falling
edge or falling edge and low level sensitive. The MODE bit in INTSCR controls the triggering sensitivity
of the IRQ pin.
相关PDF资料
PDF描述
MC13213 SPECIALTY MICROPROCESSOR CIRCUIT, PBGA71
MSP430F4491IPZR 16-BIT, FLASH, 8 MHz, RISC MICROCONTROLLER, PQFP100
MAC7136MVM50 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PBGA208
MAC7141CFU50 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PQFP100
MC9S12XEG128MAA 32-BIT, FLASH, 50 MHz, RISC MICROCONTROLLER, PQFP80
相关代理商/技术参数
参数描述
MC68HC08SR12 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08TV24CFB 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MC68HC08XL36 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC08XL36CB 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit
MC68HC08XL36CFU 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit