MC68HC705BD3 FREESCALE [Freescale Semiconductor, Inc], MC68HC705BD3 Datasheet - Page 38

• Manufacturer Part Number: MC68HC705BD3
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

4
4-6
Interrupt signals
Wired ORed
IRQN bit
IRQ pin
IRQ
IRQ
Figure 4-3 External Interrupt Circuit and Timing
V
DD
RESETS AND INTERRUPTS
D
t
ILIH
t
C
ILIL
(a) Interrupt Function Diagram
R
(b) Interrupt Mode Diagram
t
ILIL
&
Q
Q
+
+
I BIT (CCR)
Power-On Reset
External Reset
External Interrupt
being serviced
(read of vectors)
EDGE SENSITIVE TRIGGER
CONDITION
The minimum pulse width t
internal bus period. The period t
should not be less than the number of
t
interrupt service routine plus 21 tcyc
cycles.
If after servicing an interrupt the IRQ
pin remains low, then the next interrupt
is recognized. Normally used with wired
OR connection.
Normally used with pull-up resistors for
wired-OR connection.
CYC
LEVEL SENSITIVE TRIGGER
CONDITION
&
cycles it takes to execute the
MC68HC05BD3
Interrupt
External
Request
ILIH
is one
ILIL
TPG