Preliminary
SYSTEM CONTROLLER
S3C2451X RISC MICROPROCESSOR
2-30
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
POWER MANAGEMENT REGISTERS (PWRMODE AND PWRCFG)
If you want to change the power management mode, you just write a bit(s) into PWRMODE register. Before
writing, you must configure condition to wake-up from the power down mode.
Register Address
R/W
Description
Reset
Value
PWRMODE
0x4C00_0040
R/W
Power mode control register
0x0000_0000
PWRCFG 0x4C00_0060
R/W
Power
management configuration register
0x0000_0000
S3C2451X consists of three power-down modes, which are IDLE, STOP, and SLEEP. The mode transition from
the NORMAL mode occurs when the appropriate value is written into PWRMODE register. If software tries to write
illegal value, i.e., tries to set multiple power modes concurrently, then the write operation will be ignored.
PWRMODE Bit
Description Initial
Value
RESERVED [31:18]
RESERVED
0x0_0000
IDLE
[17]
The system enters into IDLE mode when this field is set to ‘1’.
0
STOP [16]
The system enters into STOP mode when this field is set to
‘1’.
0
SLEEP [15:0]
The system enters into SLEEP mode when this field is set to
‘0x2BED’. The bit pattern, ‘0x2BED’, represents “Go To BED”.
0