VSC056KM datasheet(25/134 Pages) MAXIM

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VSC056

Data Sheet

Revision 4.1

January 2008

3.2.8

07h: General-Purpose I/O Port 7 Data (GPD7)

The following table shows the bit assignments for the General-Purpose I/O Port 7 Data register.

3.2.9

10h: I/O Port 0 Data Direction (DDP0)

The following table shows the bit assignments for the I/O Port 0 Data Direction register.

GPD7

Address:

07h

Reset Value:

XXXX_XXXXb

Bit

Bit Label

Access

Description

7:0

GPD7.7-0

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.

DDP0

Address:

10h

Reset Value:

1111_1111b

Bit

Bit Label

Access

Description

7:0

DDP0.7-0

R/W

Data Direction

These bits determine the direction of the data flow through the I/O pin.

To enable the respective I/O pin as an input, set the appropriate bit.

To enable the respective I/O pin as an output, reset the appropriate bit.

Each I/O pin can be individually configured as a true bidirectional function. To

implement an open-drain or open-source function, set or reset the appropriate

data bit using the data direction bit as the programmed data value.

After a reset or power on, these bits are set to a binary 1, enabling the I/O as an

input with weak pull-up.

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