vsc055xkm-01 Maxim Integrated Products, Inc., vsc055xkm-01 Datasheet - Page 24

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

3.2.6
3.2.7
Revision 4.1
January 2008
05h: General-Purpose I/O Port 5 Data (GPD5)
The following table shows the bit assignments for the General-Purpose I/O Port 5 Data 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.
06h: General-Purpose I/O Port 6 Data (GPD6)
The following table shows the bit assignments for the General-Purpose I/O Port 6 Data 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
GPD5.7-0
Bit Label
GPD6.7-0
GPD5
05h
XXXX_XXXXb
GPD6
06h
XXXX_XXXXb
Access Description
R/W
Access Description
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.
General-Purpose Data
When the I/O pin has been 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 has been 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.
24 of 133
VSC055-01
Data Sheet