vsc055xkm-01 Maxim Integrated Products, Inc., vsc055xkm-01 Datasheet - Page 28

• Manufacturer Part Number: vsc055xkm-01
• Description: Enhanced I?c Backplane Controller
• Manufacturer: Maxim Integrated Products, Inc.

3.2.14 15h: I/O Port 5 Data Direction (DDP5)
3.2.15 16h: I/O Port 6 Data Direction (DDP6)
Revision 4.1
January 2008
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.
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.
Register Name:
Address:
Reset Value:
Bit
7:0
Register Name:
Address:
Reset Value:
Bit
7:0
Bit Label
DDP5.7-0
Bit Label
DDP6.7-0
DDP5
15h
1111_1111b
DDP6
16h
1111_1111b
Access
R/W
Access
R/W
Description
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.
Description
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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VSC055-01
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