User's Manual

I/O PORTS S3C2450X RISC MICROPROCESSOR
11-12
3.2 PORT B CONTROL REGISTERS (GPBCON, GPBDAT, GPBUDP, GPBSEL)
Register Address R/W Description Reset Value
GPBCON 0x56000010 R/W Configures the pins of port B 0x0
GPBDAT 0x56000014 R/W The data register for port B 0x0
GPBUDP 0x56000018 R/W Pull-up/down control register for port B 0x00154555
GPBSEL 0x5600001c R/W Selects the function of port B 0x1
GPBCON Bit Description
Reserved [31:22] Reserved
GPB10 [21:20] 00 = Input 01 = Output
10 = nXDREQ[0] 11 = XDREQ[0]
GPB9 [19:18] 00 = Input 01 = Output
10 = nXDACK[0] 11 = XDACK[0]
GPB8 [17:16] 00 = Input 01 = Output
10 = nXDREQ[1] 11 = XDREQ[1]
GPB7 [15:14] 00 = Input 01 = Output
10 = nXDACK[1] 11 = XDACK[1]
GPB6 [13:12] 00 = Input 01 = Output
10 = nXBREQ 11 = XBREQ
GPB5 [11:10] 00 = Input 01 = Output
10 = nXBACK 11 = XBACK
GPB4 [9:8] 00 = Input 01 = Output
10 = TCLK 11 = reserved
GPB3 [7:6] 00 = Input 01 = Output
10 = TOUT3 11 = reserved
GPB2 [5:4] 00 = Input 01 = Output
10 = TOUT2 11 = reserved
GPB1 [3:2] 00 = Input 01 = Output
10 = TOUT1 11 = reserved
GPB0 [1:0] 00 = Input 01 = Output
10 = TOUT0 11 = reserved
GPBDAT Bit Description
Reserved [31:11] Reserved
GPBDAT[10:0] [10:0] 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.