MCP23018 查看數據表（PDF） - Microchip Technology

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MCP23018

16-Bit I/O Expander with Open-Drain Outputs

Microchip Technology 

MCP23018/MCP23S18

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 INT-

CON) to compare against the DEFVAL register, an

opposite value on the associated pin will cause an

interrupt to occur.

REGISTER 1-6: DEFVAL – DEFAULT VALUE REGISTER

R/W-0

DEF7

bit 7

R/W-0

DEF6

R/W-0

DEF5

R/W-0

DEF4

R/W-0

DEF3

R/W-0

DEF2

R/W-0

DEF1

R/W-0

DEF0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘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.

© 2008 Microchip Technology Inc.

DS22103A-page 21

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