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MCP23009ESS Datasheet(PDF) 16 Page - Microchip Technology

No. de pieza MCP23009ESS
Descripción Electrónicos  8-Bit I/O Expander with Open-Drain Outputs
PDF  50 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP23009ESS Datasheet(HTML) 16 Page - Microchip Technology

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MCP23009/MCP23S09
DS22121B-page 16
© 2009 Microchip Technology Inc.
1.6.1
I/O DIRECTION REGISTER
Controls the direction of the data I/O.
When a bit is set, the corresponding pin becomes an
input. When a bit is clear, the corresponding pin
becomes an output.
REGISTER 1-1:
IODIR – I/O DIRECTION REGISTER
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
IO7
IO6
IO5
IO4
IO3
IO2
IO1
IO0
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
IO7:IO0: Controls the direction of data I/O <7:0>
1
= Pin is configured as an input
0
= Pin is configured as an output



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