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| MC68HC05F8 Datasheet, PDF (41/126 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit | |||
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Freescale Semiconductor, Inc.
IRQx sensitivity option INTNx
+
INTERRUPT PIN
IRQx
VDD
INTFx bit
+
D
Q
C
&
EXTERNAL
INTERRUPT
REQUEST
Q
R
I BIT (CC)
5
IRQx
IRQi
Wired ORed
Interrupt signals
IRQn
IRQ (MCU)
+
(a) Interrupt Function Diagram
POWER ON RESET
EXTERNAL RESET
WRITE â0â TO CLEAR INTFx
tILIH
tILIL
tILIL
EDGE SENSITIVE TRIGGER
CONDITION
The minimum pulse width tILIH is either
140ns (VDD=5V) or 280ns (VDD=3V).
The period tILIL should not be less than
the number of tcyc cycles it takes to ex-
ecute the interrupt service routine plus
21 tcyc cycles.
LEVEL SENSITIVE TRIGGER
CONDITION
If after servicing an interrupt the
external interrupt pins remain low, then
the next interrupt is recognized.
Normally used with wired OR
connection.
(b) Interrupt Mode Diagram
Figure 5-3 External Interrupt Circuit and Timing
MC68HC05F8
INTERRUPTS
For More Information On This Product,
Go to: www.freescale.com
TPG
MOTOROLA
5-5
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