MCP23S17 Microchip Technology, MCP23S17 Datasheet - Page 22

• Manufacturer Part Number: MCP23S17
• Description: 16-Bit I/O Expander with Serial Interface
• Manufacturer: Microchip Technology

MCP23017/MCP23S17
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:
DS21952B-page 22
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
R/W-0
GP7
PORT REGISTER
GP7:GP0: These bits reflect 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 (ADDR 0x09)
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
© 2007 Microchip Technology Inc.
x = Bit is unknown
R/W-0
GP1
R/W-0
GP0
bit 0