MCP23S17 Microchip Technology, MCP23S17 Datasheet - Page 19

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

1.6.7
The GPPU register controls the pull-up resistors for the
port pins. If a bit is set and the corresponding pin is
configured as an input, the corresponding port pin is
internally pulled up with a 100 kΩ resistor.
REGISTER 1-7:
© 2007 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-0
R/W-0
PU7
PULL-UP RESISTOR
CONFIGURATION REGISTER
PU7:PU0: These bits control the weak pull-up resistors on each pin (when configured as an input)
<7:0>.
1 = Pull-up enabled.
0 = Pull-up disabled.
R/W-0
PU6
GPPU – GPIO PULL-UP RESISTOR REGISTER (ADDR 0x06)
W = Writable bit
‘1’ = Bit is set
R/W-0
PU5
R/W-0
PU4
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
MCP23017/MCP23S17
R/W-0
PU3
R/W-0
PU2
x = Bit is unknown
R/W-0
PU1
DS21952B-page 19
R/W-0
PU0
bit 0