mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 101

• Manufacturer Part Number: mc68hc908gp32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
External Interrupt (IRQ)
9.1 Introduction
The IRQ (external interrupt) module provides a maskable interrupt input.
9.2 Features
Features of the IRQ module include:
9.3 Functional Description
A low level applied to the external interrupt request (IRQ) pin can latch a CPU interrupt request.
shows the structure of the IRQ module.
Freescale Semiconductor
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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
IRQ
IRQ VECTOR
DECODER
FETCH
V
DD
RESET
ACK
INTERNAL
PULLUP
DEVICE
Figure 9-1. IRQ Module Block Diagram
V
MODE
DD
MC68HC908GP32 Data Sheet, Rev. 10
IRQ LATCH
D
NOTE: On FLASH devices, high-voltage disables FLASH block protection.
CK
CLR
Q
IMASK
SYNCHRONIZER
VOLTAGE
DETECT
HIGH
IRQF
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQ
INTERRUPT
REQUEST
TO MONITOR
MODE SELECT
(NOTE)
Figure 9-1
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