23017 datasheet(15/48 Pages) MICROCHIP

Il numero della parte	23017

Spiegazioni elettronici	16-Bit I/O Expander with Serial Interface

PDF	48 Pages

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Produttore elettronici	MICROCHIP [Microchip Technology]

Homepage	http://www.microchip.com

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15 / 48 page

DS21952B-page 15

MCP23017/MCP23S17

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 (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.

23017 Scheda tecnica(PDF) 15 Page - Microchip Technology