參數(shù)資料
型號: MC68HCL05J1A
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: TRANSISTOR,BJT,NPN,20V V(BR)CEO,400MA I(C),TO-39
中文描述: 微控制器
文件頁數(shù): 43/128頁
文件大?。?/td> 1620K
代理商: MC68HCL05J1A
Interrupts
Interrupt Sources
MC68HC05J1A — Rev. 3.0
Technical Data
MOTOROLA
Interrupts
43
Figure 4-1. External Interrupt Logic
External interrupt triggering sensitivity is a mask option. The IRQ pin can
be negative edge-triggered only or negative edge- and low
level-triggered.
With the mask option for an edge- and level-sensitive external interrupt
trigger, a falling edge or a low level on the IRQ 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 pin low.
With the mask option for an edge-sensitive only external interrupt trigger,
a falling edge on the IRQ pin latches an external interrupt request. A
subsequent external interrupt request can be latched only after the
voltage level on the IRQ pin returns to logic 1 and then falls again to
logic 0.
LEVEL-SENSITIVE TRIGGER
(MASK OPTION)
PA3
PA2
PA1
IRQ
PA0
IRQ
LATCH
V
DD
RST
IRQ VECTOR FETCH
IRQ STATUS AND CONTROL REGISTER
EXTERNAL
INTERRUPT
REQUEST
I
I
I
PORT A
EXTERNAL INTERRUPTS
ENABLED
(MASK OPTION)
INTERNAL DATA BUS
TO BIH & BIL
INSTRUCTION
PROCESSING
R
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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