VSC056 datasheet(28/134 Pages) MAXIM

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VSC056

Data Sheet

Revision 4.1

January 2008

3.2.14 15h: I/O Port 5 Data Direction (DDP5)

The following table shows the bit assignments for the I/O Port 5 Data Direction register.

Control of the individual I/O pins in this register can be overridden by the PBC8, PBC9, PBC10, and

PBC11 registers when port bypass control is required.

3.2.15 16h: I/O Port 6 Data Direction (DDP6)

The following table shows the bit assignments for the I/O Port 6 Data Direction register.

Control of the individual I/O pins in this register can be overridden by the PBC12, PBC13, PBC14, and

PBC15 registers when port bypass control is required.

DDP5

Address:

15h

Reset Value:

1111_1111b

Bit

Bit Label

Access

Description

7:0

DDP5.7-0

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.

DDP6

Address:

16h

Reset Value:

1111_1111b

Bit

Bit Label

Access

Description

7:0

DDP6.7-0

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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