MCP23008-ESLASHML datasheet(13/44 Pages) MICROCHIP

部件名	MCP23008-E/ML

功能描述	8-Bit I/O Expander with Serial Interface

PDF	44 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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13 / 44 page

DS21919D-page 13

MCP23008/MCP23S08

1.6.4

DEFAULT COMPARE (DEFVAL)

CHANGE

The default comparison value is configured in the

DEFVAL register. If enabled (via GPINTEN and

INTCON) to compare against the DEFVAL register, an

opposite value on the associated pin will cause an

interrupt to occur.

DEFVAL – DEFAULT VALUE REGISTER (ADDR 0x03)

R/W-0

DEF7

DEF6

DEF5

DEF4

DEF3

DEF2

DEF1

DEF0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-0

DEF7:DEF0: These bits set the compare value for pins configured for interrupt-on-change from

defaults <7:0>. Refer to INTCON.

If the associated pin level is the opposite from the register bit, an interrupt occurs.

Refer to INTCON and GPINTEN.

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