MCP23S18 Microchip Technology, MCP23S18 Datasheet - Page 28

• Manufacturer Part Number: MCP23S18
• Description: 16-Bit I/O Expander
• Manufacturer: Microchip Technology

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MCP23018/MCP23S18
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 1-12:
DS22103A-page 28
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
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
GP3
R/W-0
GP2
© 2008 Microchip Technology Inc.
x = Bit is unknown
R/W-0
GP1
R/W-0
GP0
bit 0