MC68HC705J MOTOROLA [Motorola, Inc], MC68HC705J Datasheet - Page 31

• Manufacturer Part Number: MC68HC705J
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

1.7 IRQ/V
1.8 PA0–PA7
1.9 PB0–PB5
MC68HC705J1A — Rev. 4.0
MOTOROLA
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NOTE:
The external interrupt/programming voltage pin (IRQ/V
asynchronous IRQ interrupt function of the CPU. Additionally, it is used
to program the user EPROM and mask option register. (See
Memory
The LEVEL bit in the mask option register provides negative
edge-sensitive triggering or both negative edge-sensitive and low
level-sensitive triggering for the interrupt function.
If level-sensitive triggering is selected, the IRQ/V
external resistor to V
used, it must be tied to the V
The IRQ/V
to improve noise immunity. The voltage on this pin should not exceed
V
The mask option register can enable the PA0–PA3 pins to function as
external interrupt pins.
These eight input/output (I/O) lines comprise port A, a general-purpose,
bidirectional I/O port. See
for information on PA0–PA3 external interrupts.
These six I/O lines comprise port B, a general-purpose, bidirectional I/O
port.
DD
except when the pin is being used for programming the EPROM.
and
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Section 8. External Interrupt Module
pin contains an internal Schmitt trigger as part of its input
General Description
DD
for wired-OR operation. If the IRQ/V
Section 8. External Interrupt Module (IRQ)
DD
supply.
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input requires an
(IRQ).)
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General Description
) drives the
Technical Data
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Section 2.
pin is not
IRQ/V
31
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