VSC060 datasheet(34/166 Pages) MAXIM

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VSC060

Data Sheet

Revision 4.1

January 2008

3.2.20 17h: I/O Port 7 Data Direction (DDP7)

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

3.2.21 18h: I/O Port 8 Data Direction (DDP8)

The following table shows the bit assignments for the I/O Port 8 Data Direction register.

DDP7

Address:

17h

Reset Value:

1111_1111b

Bit

Bit Label

Access

Description

7:0

DDP7.7-0

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.

DDP8

Address:

18h

Reset Value:

1111_1111b

Bit

Bit Label

Access

Description

7:0

DDP8.7-0

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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