Samsung S3C2416 User Manual page 250

I/O PORTS
GPDDAT
Reserved
GPD[15:0]
GPDUDP
GPDUDP15
~
GPDUDP0
10-16
Bit
[31:16] Reserved
[15:0] When the port is configured as input port, the corresponding bit is the pin state.
When the port is configured as output port, the pin state is the same as the
corresponding bit.
When the port is configured as functional pin, the undefined value will be read.
Bit
[31:30] [CPU:CPD]
~ 00 = pull-up/down disable
[1:0] 01 = pull-down enable
10 = pull-up enable
11 = not-available
S3C2416 RISC MICROPROCESSOR
Description
Description