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VSC060

Data Sheet

Revision 4.1

January 2008

3.2.16 13h: I/O Port 3 Data Direction (DDP3)

The following table shows the bit assignments for the I/O Port 3 Data Direction register. Control of the

individual I/O pins in this register can be overridden by the PBC0, PBC1, PBC2, and PBC3 registers when

port bypass control is required.

3.2.17 14h: I/O Port 4 Data Direction (DDP4)

The following table shows the bit assignments for the I/O Port 4 Data Direction register.

Control of the individual I/O pins in this register can be overridden by the PBC4, PBC5, PBC6, and PBC7

registers when port bypass control is required.

DDP3

Address:

13h

Reset Value:

1111_1111b

Bit

Bit Label

Access

Description

7:0

DDP3.7-0

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.

DDP4

Address:

14h

Reset Value:

1111_1111b

Bit

Bit Label

Access

Description

7:0

DDP4.7-0

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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