MCP23008 查看數據表（PDF） - Microchip Technology

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MCP23008

8-Bit I/O Expander with Serial Interface

Microchip Technology 

MCP23008/MCP23S08

1.6.10 PORT (GPIO) REGISTER

The GPIO register reflects the value on the port.

Reading from this register reads the port. Writing to this

register modifies the Output Latch (OLAT) register.

REGISTER 1-10: GPIO – GENERAL PURPOSE I/O PORT REGISTER (ADDR 0x09)

R/W-0

GP7

bit 7

R/W-0

GP6

R/W-0

GP5

R/W-0

GP4

R/W-0

GP3

R/W-0

GP2

R/W-0

GP1

R/W-0

GP0

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

GP7:GP0: These bits reflect the logic level on the pins <7:0>

1 = Logic-high.

0 = Logic-low.

© 2007 Microchip Technology Inc.

DS21919D-page 19

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