MCP23016 查看數據表（PDF） - Microchip Technology

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MCP23016

16-Bit I2C™ I/O Expander

Microchip Technology 

MCP23016

1.7.6

I/O EXPANDER CONTROL

REGISTER

• IOCON0 controls the functionality of the

MCP23016.

The IARES (Interrupt Activity Resolution) bit controls

the sampling frequency of the GP port pins. The higher

the sampling frequency, the higher the device current

requirements. If this bit is ‘0’ (default), the maximum

time to detect the activity on the port is 32 ms (max.),

which results in lower standby current. If this bit is ‘1’,

the maximum time to detect activity on the port is

200 µsec. (max.) and results in higher standby current.

REGISTER 1-11:

U-0

—

bit 7

IOCON0 - I/0 EXPANDER CONTROL REGISTER

U-0

U-0

U-0

U-0

U-0

—

—

—

—

—

U-0

R/W-0

—

IARES

bit 0

bit 1-7

Unimplemented bit: Read as ‘0’

bit 0

IARES: Interrupt Activity Resolution

1 = Fast sample rate

0 = Normal sample rate

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

IOCON1 is a shadow register for IOCON0. Access to IOCON1 results in access to IOCON0.

© 2007 Microchip Technology Inc.

DS20090C-page 11

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