MC68HC05T16
MOTOROLA
4-7
RESETS AND INTERRUPTS
4
Figure 4-3 External Interrupt Circuit and Timing
+
&
+
EXTERNAL
REQUEST
INTERRUPT
POWER-ON RESET
EXTERNAL RESET
EXTERNAL INTERRUPT
BEING SERVICED
D
C
R
Q
Q
V
DD
IRQ
LEVEL SENSITIVE TRIGGER
IRQ
I BIT (CC)
IRQ
t
ILIH
t
ILIL
EDGE SENSITIVE TRIGGER
CONDITION
The minimum pulse width t
ILIH
is either
125ns (V
DD
=5V) or 250ns (V
DD
=3V).
The period t
ILIL
should not be less than
the number of tcyc cycles it takes to ex-
ecute the interrupt service routine plus
21 tcyc cycles.
INTERRUPT PIN
t
ILIL
Wired ORed
Interrupt signals
IRQ
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
(a) Interrupt Function Diagram
LEVEL SENSITIVE TRIGGER
CONDITION
TPG
35
Summary of Contents for MC68HC05T16
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Page 110: ...MOTOROLA 12 4 MC68HC05T16 LOW POWER MODES 12 THIS PAGE LEFT BLANK INTENTIONALLY TPG 108 ...
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