MCP23018/MCP23S18
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 1-12: GPIO – GENERAL PURPOSE I/O PORT REGISTER
R/W-0
GP7
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 7
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: Reflects the logic level on the pins <7:0>.
1= Logic-high.
0= Logic-low.
DS22103A-page 28
© 2008 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
