MCP23008 Ver la hoja de datos (PDF) - Unspecified

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MCP23008

8-Bit I/O Expander with Serial Interface

Unspecified 

MCP23008/MCP23S08

1.6.2 INPUT POLARITY (IPOL) REGISTER

The IPOL 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 1-2:

IPOL – INPUT POLARITY PORT REGISTER (ADDR 0x01)

R/W-0 R/W-0 R/W-0 R/W-0

R/W-0

R/W-0

IP7

IP6

IP5

IP4

IP3

IP2

bit 7

R/W-0

IP1

R/W-0

IP0

bit 0

bit 7-0

IP7:IP0: These bits control 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.

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

© 2005 Microchip Technology Inc.

DS21919B-page 9

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