HC705V8GRSSLASHD datasheet(50/172 Pages) NXP

tên linh kiện	HC705V8GRS/D

Giải thích chi tiết về linh kiện	The Motorola MC68HC705V8 microcontroller is a custom HC05 based MCU featuring a Message Data Link Controller (MDLC) module and on-chip power regulation.

PDF	172 Pages

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nhà sản xuất	NXP [NXP Semiconductors]

Trang chủ	http://www.nxp.com

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50 / 172 page

SECTION 5: INTERRUPTS

Page 39

MC68HC705V8 Specification Rev. 2.1

Figure 5-2:

IRQ Function Block Diagram

The IRQ pin is one source of an external interrupt. All Port A pins (PA0 through PA7) and/

or all Port C pins (PC0 through 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 conﬁgured as an input, to form

the negative edge signal which sets the corresponding ﬂag bits. A high to low transition on

any Port A or Port C pin conﬁgured as an input will therefore set the respective ﬂag 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

IRQ

LATCH

IRQ Pin

IRQE

LEVEL

(in MOR or MASK option)

IRQF

to IRQ

processing

in CPU

IRQA

to BIH & BIL

instruction

sensing

RST

PA0

PA7

VDD

IRQPA

LATCH

IRQPAE

IRQPCE

IRQPAF

IRQPCF

IRQ Vector Fetch

VDD

IRQPC

LATCH

DDRA0

DDRA7

PC0

PC7

DDRC0

DDRC7

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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