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| MC68HC705J1ACPE Datasheet, PDF (31/162 Pages) Freescale Semiconductor, Inc – Freescale Semiconductor, Inc. | |||
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Freescale Semiconductor, Inc.
General Description
IRQ/VPP
1.7 IRQ/VPP
The external interrupt/programming voltage pin (IRQ/VPP) drives the
asynchronous IRQ interrupt function of the CPU. Additionally, it is used
to program the user EPROM and mask option register. (See Section 2.
Memory and Section 8. External Interrupt Module (IRQ).)
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.
NOTE:
If level-sensitive triggering is selected, the IRQ/VPP input requires an
external resistor to VDD for wired-OR operation. If the IRQ/VPP pin is not
used, it must be tied to the VDD supply.
The IRQ/VPP pin contains an internal Schmitt trigger as part of its input
to improve noise immunity. The voltage on this pin should not exceed
VDD except when the pin is being used for programming the EPROM.
The mask option register can enable the PA0âPA3 pins to function as
external interrupt pins.
1.8 PA0âPA7
These eight input/output (I/O) lines comprise port A, a general-purpose,
bidirectional I/O port. See Section 8. External Interrupt Module (IRQ)
for information on PA0âPA3 external interrupts.
1.9 PB0âPB5
These six I/O lines comprise port B, a general-purpose, bidirectional I/O
port.
MC68HC705J1A â Rev. 4.0
General Description
For More Information On This Product,
Go to: www.freescale.com
Technical Data
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