 English |
|
|
|
|
|
|
|
| MC68HC08AZ32A Datasheet, PDF (93/312 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
| |||
| ◁ |
Chapter 7
External Interrupt (IRQ) Module
7.1 Introduction
The external interrupt (IRQ) module provides the nonmaskable interrupt input.
7.2 Features
Features include:
⢠Dedicated external interrupt pins (IRQ)
⢠IRQ interrupt control bit
⢠Hysteresis buffer
⢠Programmable edge-only or edge and level interrupt sensitivity
⢠Automatic interrupt acknowledge
7.3 Functional Description
A falling edge applied to any of the external interrupt pins can latch a CPU interrupt request. Figure 7-1
shows the structure of the IRQ module.
ACK
VECTOR
FETCH
DECODER
TO CPU FOR
BIL/BIH
INSTRUCTIONS
VDD
IRQF
D CLR Q
SYNCHRO-
IRQ
CK
NIZER
IRQ
LATCH
IMASK
IRQ
INTERRUPT
REQUEST
Freescale Semiconductor
MODE
HIGH
VOLTAGE
DETECT
Figure 7-1. IRQ Module Block Diagram
MC68HC08AZ32A Data Sheet, Rev. 2
TO MODE
SELECT
LOGIC
93
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese