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MCP23009ESS Datasheet(PDF) 25 Page - Microchip Technology

Part # MCP23009ESS
Description  8-Bit I/O Expander with Open-Drain Outputs
PDF  50 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP23009ESS Datasheet(HTML) 25 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS22121B-page 25
MCP23009/MCP23S09
1.6.10
PORT 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
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
GP7
GP6
GP5
GP4
GP3
GP2
GP1
GP0
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
GP7:GP0: Reflects the logic level on the pins <7:0>.
1
=Logic-high
0
= Logic-low



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