s908ey8ad4cfjer Freescale Semiconductor, Inc, s908ey8ad4cfjer Datasheet - Page 101

• Manufacturer Part Number: s908ey8ad4cfjer
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 9
External Interrupt (IRQ)
9.1 Introduction
This section describes the non-maskable external interrupt (IRQ) input.
9.2 Features
Features include:
9.3 Functional Description
A logic 0 applied to the external interrupt pin can latch a central processor unit (CPU) interrupt request.
Figure 9-1
Freescale Semiconductor
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•
•
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Dedicated external interrupt pin (IRQ)
Hysteresis buffer
Programmable edge-only or edge- and level-interrupt sensitivity
Automatic interrupt acknowledge
shows the structure of the IRQ module.
IRQ
DECODER
VECTOR
FETCH
ACK
MC68HC908EY16 • MC68HC908EY8 Data Sheet, Rev. 10
V
MODE
DD
Figure 9-1. IRQ Block Diagram
D
CK
LATCH
CLR
IRQ
Q
IMASK
SYNCHRO-
VOLTAGE
DETECT
NIZER
HIGH
IRQF
TO CPU FOR
BIL/BIH
INSTRUCTIONS
IRQ
INTERRUPT
REQUEST
TO MODE
SELECT
LOGIC
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