Preliminary
SYSTEM CONTROLLER
S3C2451X RISC MICROPROCESSOR
2-32
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.
RESET CONTROL REGISTERS (SWRST AND RSTCON)
Software can reset S3C2451X using SWRST register. The waveform of the reset signals are determined by
RSTCON register.
Register Address
R/W
Description
Reset
Value
SWRST
0x4C00_0044
R/W
Software reset control register
0x0000_0000
RSTCON 0x4C00_0064
R/W
Reset control register
0x0006_0101
When software write the predefined value, 0x533C2451, into SWRST register, then the system controller asserts
internal reset signal and initializes internal state.
SWRST Bit
Description
Initial
Value
SWRST
[31:0]
If this field has 0x533C2451, then the system will restart.
0x0000_0000
RSTCON register controls the duration of the system reset signal.
RSTCON Bit
Description
Initial
Value
RESERVED [31:19]
-
0x0000
RESERVED
[18:17]
Should be set ‘0x3’
0x3
PWROFF_SLP [16]
Power Control on pad retention cell I/O.
Retention cell I/O’s power will be off when sleep mode, but
when wakeup process starts, User should write ‘1’ to produce
power on retention I/O (see below detailed description)
1 : set automatically when sleep mode.
0 : cleared by user writing ‘1’
0
RSTCNT [15:8]
Only watch dog and software reset can start couter which is
counted from RSTCNT value. This RSTCNT value effects
delay of releasing reset. After this counter expired, internal
reset (like HRESETn) will be HIGH state.
0x01
PWRSETCNT [7:0]
This field configures value of Power Settle Down Counter.
Only When waking up from sleep mode, Power Settle Down
Counter starts counting to wait for stability of external voltage
source. As soon as counter reachs PWRSETCNT value, the
system escape from sleep mode.
Range which user can configure is from 0x01 to 0xFE.
(Don’t write 0xFF to this field)
Real count number = (PWRSETCNT[7:0] + 1) * 2048
0x01