MC68HC05P9ACDW FREESCALE [Freescale Semiconductor, Inc], MC68HC05P9ACDW Datasheet - Page 54

• Manufacturer Part Number: MC68HC05P9ACDW
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Resets and Interrupts
54
RESET
EXTERNAL INTERRUPT VECTOR FETCH
FROM OTHER
PORT B PINS
IRQ
Setting the I bit in the condition code register disables external interrupts.
Interrupt triggering sensitivity of the IRQ pin is a mask option. The IRQ
pin can be negative-edge triggered or negative-edge- and low-level
triggered. The level-sensitive triggering option allows multiple external
interrupt sources to be wire-ORed to the IRQ pin. An external interrupt
request, shown in
the IRQ pin low.
IRQ (INTERNAL)
MASK OPTION
Freescale Semiconductor, Inc.
IRQ/V
For More Information On This Product,
Figure 20. External Interrupt Logic
PP
IRQ
IRQ
PIN
.
.
.
1
n
Go to: www.freescale.com
Resets and Interrupts
Figure 21. External Interrupt Timing
Figure
EDGE AND LEVEL
t
ILIH
V
DD
D
C
21, is latched as long as any source is holding
R
t
ILIH
Q
Q
t
ILIL
EDGE ONLY
(FROM CCR)
I BIT
INTERRUPT
EXTERNAL
REQUEST
10-mc68hc05p9a
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