Preliminary
I/O PORTS
S3C2451X RISC MICROPROCESSOR
11-16
PORT D CONTROL REGISTERS (GPDCON, GPDDAT, GPDUDP)
Register Address
R/W
Description
Reset
Value
GPDCON 0x56000030
R/W
Configures
the pins of port D
0x0
GPDDAT
0x56000034
R/W
The data register for port D
0x0
GPDUDP 0x56000038
R/W
Pull-up/down
control register for port D
0x55555555
Reserved 0x5600003c –
–
–
GPDCON Bit
Description
GPD15
[31:30]
00 = Input
01 = Output
10 = RGB_VD[23]
11 = Reserved
GPD14
[29:28]
00 = Input
01 = Output
10 = RGB_VD[22]
11 = Reserved
GPD13
[27:26]
00 = Input
01 = Output
10 = RGB_VD[21]
11 = Reserved
GPD12
[25:24]
00 = Input
01 = Output
10 = RGB_VD[20]
11 = Reserved
GPD11
[23:22]
00 = Input
01 = Output
10 = RGB_VD[19]
11 = Reserved
GPD10
[21:20]
00 = Input
01 = Output
10 = RGB_VD[18]
11 = Reserved
GPD9
[19:18]
00 = Input
01 = Output
10 = RGB/SYS_VD[17]
11 = Reserved
GPD8
[17:16]
00 = Input
01 = Output
10 = RGB/SYS _VD[16] 11 = Reserved
GPD7
[15:14]
00 = Input
01 = Output
10 = RGB/SYS _VD[15]
11 = Reserved
GPD6
[13:12]
00 = Input
01 = Output
10 = RGB/SYS _VD[14] 11 = Reserved
GPD5
[11:10]
00 = Input
01 = Output
10 = RGB/SYS _VD[13] 11 = Reserved
GPD4
[9:8]
00 = Input
01 = Output
10 = RGB/SYS _VD[12] 11 = Reserved
GPD3
[7:6]
00 = Input
01 = Output
10 = RGB/SYS _VD[11] 11 = Reserved
GPD2
[5:4]
00 = Input
01 = Output
10 = RGB/SYS _VD[10]
11 = Reserved
GPD1
[3:2]
00 = Input
01 = Output
10 = RGB/SYS _VD[9] 11 = Reserved
GPD0
[1:0]
00 = Input
01 = Output
10 = RGB/SYS _VD[8]
11 = Reserved