Preliminary
I/O PORTS
S3C2451X RISC MICROPROCESSOR
11-14
PORT C CONTROL REGISTERS (GPCCON, GPCDAT, GPCUDP)
Register Address
R/W
Description
Reset
Value
GPCCON 0x56000020 R/W
Configures
the pins of port C
0x0
GPCDAT
0x56000024
R/W
The data register for port C
0x0
GPCUDP 0x56000028 R/W
Pull-up/down
control for port C
0x55555555
Reserved 0x5600002c –
–
–
GPCCON Bit
Description
GPC15
[31:30]
00 = Input
01 = Output
10 = RGB/SYS_VD[7] 11 = Reserved
GPC14
[29:28]
00 = Input
01 = Output
10 = RGB/SYS_VD[6]
11 = Reserved
GPC13
[27:26]
00 = Input
01 = Output
10 = RGB/SYS_VD[5]
11 = Reserved
GPC12
[25:24]
00 = Input
01 = Output
10 = RGB/SYS_VD[4]
11 = Reserved
GPC11
[23:22]
00 = Input
01 = Output
10 = RGB/SYS_VD[3]
11 = Reserved
GPC10
[21:20]
00 = Input
01 = Output
10 = RGB/SYS_VD[2]
11 = Reserved
GPC9
[19:18]
00 = Input
01 = Output
10 = RGB/SYS_VD[1] 11 = Reserved
GPC8
[17:16]
00 = Input
01 = Output
10 = RGB/SYS_VD[0]
11 = Reserved
GPC7
[15:14]
00 = Input
01 = Output
10 = Reserved 11 = Reserved
GPC6
[13:12]
00 = Input
01 = Output
10 = Reserved 11 = Reserved
GPC5
[11:10]
00 = Input
01 = Output
10 = Reserved 11 = Reserved
GPC4
[9:8]
00 = Input
01 = Output
10 = RGB_VDEN/SYS_RS
11 = Reserved
GPC3
[7:6]
00 = Input
01 = Output
10 = RGB_VSYNC/SYS_CS1 11 = Reserved
GPC2
[5:4]
00 = Input
01 = Output
10 = RGB_HSYNC/SYS_CS0 11 = Reserved
GPC1
[3:2]
00 = Input
01 = Output
10 = RGB_VCLK/SYS_WR
11 = Reserved
GPC0
[1:0]
00 = Input
01 = Output
10 = RGB_LEND/SYS_OE
11 = Reserved