參數(shù)資料
型號： MC68HC705J1Ac
廠商： 飛思卡爾半導體(中國)有限公司
英文描述： Microcontrollers
中文描述： 微控制器
文件頁數(shù)： 31/162頁
文件大小： 1085K
代理商： MC68HC705J1AC
General Description
IRQ/V
PP
MC68HC705J1A — Rev. 4.0
Technical Data
General Description
1.7 IRQ/V
PP
The external interrupt/programming voltage pin (IRQ/V
PP
) 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.
If level-sensitive triggering is selected, the IRQ/V
PP
input requires an
external resistor to V
DD
for wired-OR operation. If the IRQ/V
PP
pin is not
used, it must be tied to the V
DD
supply.
The IRQ/V
PP
pin contains an internal Schmitt trigger as part of its input
to improve noise immunity. The voltage on this pin should not exceed
V
DD
except when the pin is being used for programming the EPROM.
NOTE:
The mask option register can enable the PA0
–
PA3
pins to function as
external interrupt pins.
1.8 PA0–PA7
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 PA0–PA3 external interrupts.
1.9 PB0–PB5
These six I/O lines comprise port B, a general-purpose, bidirectional I/O
port.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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