MCP23009ESS datasheet(19/50 Pages) MICROCHIP

No de pièce	MCP23009ESS

Description	8-Bit I/O Expander with Open-Drain Outputs

PDF	50 Pages

Scroll/Zoom	100%

Fabricant	MICROCHIP [Microchip Technology]

Site Internet	http://www.microchip.com

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19 / 50 page

DS22121B-page 19

MCP23009/MCP23S09

1.6.4

DEFAULT COMPARE REGISTER

FOR INTERRUPT-ON-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

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: Sets 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.

MCP23009ESS Fiches technique(PDF) 19 Page - Microchip Technology