Samsung S3C2440A - Manual (Page 255)

S3C2440A RISC MICROPROCESSOR I/O PORTS
9-9
GPADAT Bit Description
GPA[24:0] [24:0] 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.
Note : nRSTOUT = nRESET & nWDTRST & SW_RESET