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): 104/162頁
文件大?。?/td> 1085K
代理商: MC68HC705J1AC
Technical Data
MC68HC705J1A — Rev. 4.0
External Interrupt Module (IRQ)
For More Information On This Product,
Go to: www.freescale.com
External Interrupt Module (IRQ)
8.3.1 IRQ/V
PP
Pin
An interrupt signal on the IRQ/V
PP
pin latches an external interrupt
request. 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 edge- and level-sensitive triggering is selected, a falling edge or a low
level on the IRQ/V
PP
pin latches an external interrupt request. Edge- and
level-sensitive triggering allows the use of multiple wired-OR external
interrupt sources. An external interrupt request is latched as long as any
source is holding the IRQ/V
PP
pin low.
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.
If edge-sensitive-only triggering is selected, a falling edge on the
IRQ/V
PP
pin latches an external interrupt request. A subsequent external
interrupt request can be latched only after the voltage level on the
IRQ/V
PP
pin returns to logic 1 and then falls again to logic 0.
The IRQ/V
PP
pin contains an internal Schmitt trigger as part of its input
to improve noise immunity. The voltage on this pin can affect the mode
of operation and should not exceed V
DD
.
8.3.2 Optional External Interrupts
The inputs for the lower four bits of port A (PA0–PA3) can be connected
to the IRQ pin input of the CPU if enabled by the PIRQ bit in the mask
option register. This capability allows keyboard scan applications where
the transitions or levels on the I/O pins will behave the same as the
IRQ/V
PP
pin except for the inverted phase (logic 1, rising edge). The
active state of the IRQ/V
PP
pin is a logic 0 (falling edge).
The PA0–PA3 pins are selected as a group to function as IRQ interrupts
and are enabled by the IRQE bit in the IRQ status and control register.
The PA0–PA3 pins can be positive-edge triggered only or positive-edge
and high-level triggered.
F
Freescale Semiconductor, Inc.
n
.
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