Preliminary
S3C2451X RISC MICROPROCESSOR
I/O PORTS
11-33
MISCELLANEOUS CONTROL REGISTER (MISCCR)
In Sleep mode, the data bus(SD[15:0] or RD[15:0] can be set as Hi-Z and Output ‘0’ state. But, because of the
characteristics of IO pad, the data bus pull-up/down resisters have to be turned on or off to reduce the power
consumption. SD[15:0] or RD[15:0] pin pull-up/down resisters can be controlled by MISCCR register.
Pads related USB are controlled by this register for USB host, or for USB device.
Register Address
R/W
Description
Reset
Value
MISCCR 0x56000080
R/W
Miscellaneous
control register
0xd0000020
MISCCR Bit
Description
Reset
Value
HSSPI_EN2
[31]
Must be set ‘1’
1
nCD_CF [30]
nCD_CF Signal Register
0 : card detected
1 : card not detected
1
Reserved [29]
Reserved
0
Reserved
[28]
Should be ‘1’
1
Reserved [27:25]
Reserved
000
FLT_I2C
[24]
Clocked Noise Filter Enable for IIC
0
Reserved [23:15]
Reserved
0
USB_DPPD
[14]
USB DP Pull-down control
0 : disable 1: enable
0
USB_DNPD
[13]
USB DN Pull-down control
0 : disable 1: enable
0
SEL_SUSPND [12]
USB Port Suspend mode
0 = Normal mode 1 = Suspend mode
0
Reserved [11]
Reserved
0
CLKSEL1 *
[10:8]
Select source clock with CLKOUT1 pad
000 = RESERVED
001 = Gated EPLL output
010 = RTC clock output
011 = HCLK
100 = PCLK
101 = DCLK1(Divided PCLK)
11x = reserved
000
Reserved [7]
Reserved
0
CLKSEL0 *
[6:4]
Select source clock with CLKOUT0 pad
000 = MPLL INPUT Clock(XTAL)
001 = EPLL output
010 = FCLK(ARMCLK)
011 = HCLK
100 = PCLK
101 = DCLK0 (Divided PCLK)
110 = OSC To PLL INPUT Clock
111 = reserved
010