LPC47N237-MD SMSC [SMSC Corporation], LPC47N237-MD Datasheet - Page 84

• Manufacturer Part Number: LPC47N237-MD
• Description: 3.3V I/O CONTROLLER FOR PORT REPLICATORS AND DOCKING STATIONS
• Manufacturer: SMSC [SMSC Corporation]

15.3.1 GPIO Pins
15.4
15.4.1 Direction Registers
15.4.2 Output Type Registers
15.4.3 Data Registers
15.4.4 GPIO Mask Registers
Revision 0.3 (10-26-04)
GP10 – GP17,
GP20 – GP27,
GP30 – GP37,
GP50 – GP57
PIN NAME
Table 15.4 shows the SMBus GPIOs pins.
SMBus GPIO Registers
See the following sub section for functionality of the SMBus GPIO registers. These registers are in the
SMBus runtime register space and are listed in the “SMBus GPIO Register Map” section.
There are four direction registers containing bits for each GPIO pin. The Direction register is used to
select input or output direction on the GPIO pin.
There are four output type registers containing bits for each GPIO pin. The output type register is used to
selection whether the GPIO pin will be push-pull or open-drain.
The data register will reflect the state of the GPIO input if the GP pin is used as input. It is used to set the
state of the GPIO pin when the GPIO is used as output.
There are four mask registers containing bits for each GPIO pin. The bits in the Mask registers are used
to enable/disable wakeup events on the Change Status register. See the “GPIO Change Status Register”
section for more information.
4 Direction Registers
4 Output Type Registers
4 Data Registers
4 Mask Registers
1 Change Status Register
These pins are powered by VTR
These pins sink 8mA and source 4 mA current under VTR power.
The default on these pins will be input on VTR POR in the LPC47N237.
BUFFER
IO8
PWR WELL
Table 15.4 – SMBus GPIO Pins
VTR
DATASHEET
Page 84
General Purpose I/O
3.3v I/O Controller for Port Replicators and Docking Stations
DESCRIPTION
SMSC DS – LPC47N237