mc68hc05bs8 Freescale Semiconductor, Inc, mc68hc05bs8 Datasheet - Page 40

• Manufacturer Part Number: mc68hc05bs8
• Description: Mc68hc05 Family Of Low-cost Single-chip Microcontrollers.
• Manufacturer: Freescale Semiconductor, Inc

5
5-6
Interrupt signals
Wired ORed
INTO bit
IRQ pin
IRQ
IRQ
Figure 5-3 External Interrupt Circuit and Timing
V
DD
D
C
R
RESETS AND INTERRUPTS
t
ILIH
t
Q
Q
ILIL
(a) Interrupt Function Diagram
(b) Interrupt Mode Diagram
t
ILIL
&
&
+
Power-On Reset
External Reset
External Interrupt
being serviced
(read of vectors)
+
I-BIT (CCR)
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 pull-up resistors for
wired-OR connection.
CYC
LEVEL SENSITIVE TRIGGER
CONDITION
cycles it takes to execute the
&
MC68HC05BS8
Interrupt
External
Request
ILIH
is one
ILIL
TPG