Power Control Register - Samsung S3C2416 User Manual

S3C2416X RISC MICROPROCESSOR

5.12 POWER CONTROL REGISTER

This register contains the SD Command Argument.
Register Address
PWRCON0 0X4AC00029
PWRCON1 0X4A800029
Name Bit
[7:4]
SELPWRLVL [3:1]
PWRON [0]
R/W
R/W Present State Register (Channel 0)
R/W Present State Register (Channel 1)
Reserved
SD Bus Voltage Select
By setting these bits, the Host Driver selects the voltage level for the
SD card. Before setting this register, the Host Driver shall check the
Voltage Support bits in the Capabilities register. If an unsupported
voltage is selected, the Host System shall not supply SD Bus voltage.
111b = 3.3V (Typ.)
110b = 3.0V (Typ.)
101b = 1.8V (Typ.)
100b − 000b = Reserved
SD Bus Power
Before setting this bit, the SD Host Driver shall set SD Bus Voltage
Select. If the Host Controller detects the No Card state, this bit shall
be cleared.
If this bit is cleared, the Host Controller shall immediately stop driving
CMD and DAT[3:0] (tri-state) and drive SDCLK to low level.
1 = Power on
0 = Power off
Description
Description
HSMMC CONTROLLER
Reset Value
0x0
0x0
Initial Value
0
0
20-37