MCP23008 查看數據表（PDF） - Microchip Technology

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MCP23008

8-Bit I/O Expander with Serial Interface

Microchip Technology 

MCP23008/MCP23S08

1.6.7

PULL-UP RESISTOR

CONFIGURATION (GPPU)

REGISTER

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: GPPU – GPIO PULL-UP RESISTOR REGISTER (ADDR 0x06)

R/W-0

PU7

bit 7

R/W-0

PU6

R/W-0

PU5

R/W-0

PU4

R/W-0

PU3

R/W-0

PU2

R/W-0

PU1

R/W-0

PU0

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

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.

DS21919D-page 16

© 2007 Microchip Technology Inc.

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