MCP23S09 Microchip Technology, MCP23S09 Datasheet - Page 25

• Manufacturer Part Number: MCP23S09
• Description: 8-Bit I/O Expander
• Manufacturer: Microchip Technology

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1.6.10
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:
© 2009 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
R/W-0
GP7
PORT REGISTER
GP7:GP0: Reflects the logic level on the pins <7:0>.
1 = Logic-high
0 = Logic-low
R/W-0
GP6
GPIO – GENERAL PURPOSE I/O PORT REGISTER
W = Writable bit
‘1’ = Bit is set
R/W-0
GP5
R/W-0
GP4
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
MCP23009/MCP23S09
R/W-0
GP3
R/W-0
GP2
x = Bit is unknown
R/W-0
GP1
DS22121B-page 25
R/W-0
GP0
bit 0