Datasheet

External Interrupt (IRQ)
Functional Description
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA External Interrupt (IRQ) 169
NOTE: The interrupt mask (I) in the condition code register (CCR) masks all
interrupt requests, including external interrupt requests.
Figure 12-1. IRQ Module Block Diagram
IRQ1
ACK
IMASK
DQ
CK
CLR
IRQ
HIGH
INTERRUPT
TO MODE
SELECT
LOGIC
IRQ
FF
REQUEST
V
DD
MODE
VOLTAGE
DETECT
SYNCHRO-
NIZER
IRQF
TO CPU FOR
BIL/BIH
INSTRUCTIONS
VECTOR
FETCH
DECODER
INTERNAL ADDRESS BUS
RESET
V
DD
INTERNAL
PULLUP
DEVICE
Addr.Register Name Bit 7654321Bit 0
$001D
IRQ Status and Control
Register (INTSCR)
Read: 0000IRQF0
IMASK MODE
Write:
ACK
Reset:00000000
= Unimplemented
Figure 12-2. IRQ I/O Register Summary
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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