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

1.6.2 INPUT POLARITY REGISTER

This register allows the user to configure the polarity on

the corresponding GPIO port bits.

If a bit is set, the corresponding GPIO register bit will

reflect the inverted value on the pin.

REGISTER 1-4: IPOL – INPUT POLARITY PORT REGISTER

R/W-0

IP7

bit 7

R/W-0

IP6

R/W-0

IP5

R/W-0

IP4

R/W-0

IP3

R/W-0

IP2

R/W-0

IP1

R/W-0

IP0

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

IP7:IP0: Controls the polarity inversion of the input pins <7:0>

1 = GPIO register bit will reflect the opposite logic state of the input pin.

0 = GPIO register bit will reflect the same logic state of the input pin.

© 2008 Microchip Technology Inc.

DS22103A-page 19

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