mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 91

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 8
External Interrupt (IRQ)
8.1 Introduction
This section describes the external interrupt (IRQ) module, which supports external interrupt functions.
8.2 Features
Features of the IRQ module include:
8.3 Functional Description
A logic 0 applied to any of the external interrupt pins can latch a CPU interrupt request.
the structure of the IRQ module.
Freescale Semiconductor
$003F
Addr.
•
•
IRQ
A dedicated external interrupt pin, IRQ
Hysteresis buffers
IRQ Status/Control Register
Register Name
See page 94.
V
MODE1
DD
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
(ISCR)
D
CK
LATCH
ACK1
CLR
IRQ
Figure 8-1. IRQ Module Block Diagram
Figure 8-2. IRQ I/O Register Summary
Q
Reset:
Read:
Write:
Bit 7
R
R
0
0
IMASK1
= Reserved
R
6
0
0
SYNCHRO-
VOLTAGE
DETECT
NIZER
HIGH
R
5
0
0
R
4
0
0
IRQF
3
0
ACK1
2
0
0
Figure 8-1
IMASK1
IRQ
INTERRUPT
REQUEST
TO MODE
SELECT
LOGIC
1
0
shows
MODE1
Bit 0
0
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