參數(shù)資料
型號(hào): MC68HC05V7CFU
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁數(shù): 113/170頁
文件大小: 980K
代理商: MC68HC05V7CFU
SECTION 5: INTERRUPTS
MOTOROLA
Page 33
MC68HC05V7 Specification Rev. 1.0
Figure 5-2:
IRQ Function Block Diagram
The IRQ pin is one source of an external interrupt. All Port A pins (PA0 thru PA7) and/or all
Port C pins (PC0 thru PC7) act as other external interrupt sources. These sources each
have their own interrupt latch but are all combined into a single external interrupt request.
The Port A and Port C interrupt sources are negative (falling) edge sensitive only. Note
that all Port A pins and all Port C pins are ANDed together, if congured as an input, to form
the negative edge signal which sets the corresponding ag bits. A high to low transition on
any Port A or Port C pin congured as an input will therefore set the respective ag bit. If a
Port A or Port C pin is an input and is not used as a switch input in the system, it must
remain high to prevent spurious interrupts from occurring. Refer to 9.1.3 PORT A/C I/O PIN
INTERRUPTS for more detail on Port A/Port C interrupts. The IRQ pin interrupt source may
be selected to be either edge sensitive or edge and level sensitive through a mask option
or an MOR bit. If the EDGE sensitive interrupt option is selected for the IRQ pin, only the
IRQ
LATCH
R
VD
IRQ Pin
IRQE
LEVEL
(MASK option)
IRQF
to IRQ
processing
in CPU
IRQA
to BIH & BIL
instruction
sensing
RST
PA0
PA7
VD
IRQPA
LATCH
R
IRQPAE
R
IRQPCE
IRQPAF
IRQPCF
IRQ Vector Fetch
VD
IRQPC
LATCH
DDRA0
DDRA7
PC0
PC7
DDRC0
DDRC7
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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