VSC056 datasheet(22/134 Pages) MAXIM

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VSC056

Data Sheet

Revision 4.1

January 2008

3.2.2

01h: General-Purpose I/O Port 1 Data (GPD1)

The following table shows the bit assignments for the General-Purpose I/O Port 1 Data register.

3.2.3

02h: General-Purpose I/O Port 2 Data (GPD2)

The following table shows the bit assignments for the General-Purpose I/O Port 2 Data register.

GPD1

Address:

01h

Reset Value:

XXXX_XXXXb

Bit

Bit Label

Access Description

7:0

GPD1.7-0

R/W

General-Purpose Data

When the I/O pin is enabled as an output, writing these bits determines the data

value that will be present on the corresponding I/O pin.

If the I/O pin is enabled as an input, reading these register bits represents the

current voltage applied to the pin. At no time do the bits directly represent the

value latched into the data register

If a pin is enabled as an input and there is no signal applied, weak internal pull-up

resistors hold the pin at a binary 1.

After a reset or power on, the register bits are set to a binary 1, however, the value

returned from a register read is the level applied to the pin since each pin is an

input by default.

GPD2

Address:

02h

Reset Value:

XXXX_XXXXb

Bit

Bit Label

Access Description

7:0

GPD2.7-0

R/W

General-Purpose Data

When the I/O pin is enabled as an output, writing these bits determines the data

value that will be present on the corresponding I/O pin.

If the I/O pin is enabled as an input, reading these register bits represents the

current voltage applied to the pin. At no time do the bits directly represent the

value latched into the data register.

If a pin is enabled as an input and there is no signal applied, weak internal pull-up

resistors hold the pin at a binary 1.

After a reset or power on, the register bits are set to a binary 1, however, the

value returned from a register read is the level applied to the pin since each pin is

an input by default.

VSC056 Datasheet(PDF) 22 Page - Maxim Integrated Products

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