VSC060 datasheet(28/166 Pages) MAXIM

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VSC060

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

08h: General-Purpose I/O Port 8 Data (GPD8)

The following table shows the bit assignments for the General-Purpose I/O Port 8 Data 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.

GPD8

Address:

08h

Reset Value:

XXXX_XXXXb

Bit

Bit Label

Access

Description

7:0

GPD8.7-0

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, but the value

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

input by default.

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