Preliminary
S3C2451X RISC MICROPROCESSOR
I/O PORTS
11-31
PORT L CONTROL REGISTERS (GPLCON, GPLDAT, GPLUDP,GPLSEL) (Continued)
GPLDAT Bit
Description
Reserved [31:15]
Reserved
GPL[14:0]
[14:0]
When the port is configured as an input port, the corresponding bit is the
pin state. When the port is configured as an 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.
GPLUDP
Bit
Description
Reserved [31:30]
Reserved
GPLUDP14
~
GPLUDP0
[29:28]
~
[1:0]
[CPU:CPD]
00 : pull-up/down disable
01 : pull-down enable
10 : pull-up enable
11 : not-available
GPLSEL
Bit
Description
Reserved [31:4]
Reserved
GPL7SEL
[3]
0 = GPL7 1 = PCM1_SDO
GPL6SEL
[2]
0 = GPL6 1 = PCM1_SDI
GPL5SEL
[1]
0 = GPL5 1 = PCM1_CDCLK
GPL4SEL
[0]
0 = GPL4 1 = PCM1_SCLK