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S3C2416X RISC MICROPROCESSOR
SYSTEM
CONTROLLER
2-5
4.4 SOFTWARE
RESET
Software can initialize the device state itself when it writes “0x533C_2416” to SWRST register.
During the software reset, the following actions occur :
•
All units(except some blocks listed in table 2-1 ) go into their pre-defined reset state.
•
All pins get their reset state, and BATT_FLT pin is ignored.
•
The nRSTOUT pin is asserted during software reset.
Software reset is invoked then, the following sequence occurs. :
1. User write “0x533C_2416” to SWRST register.
2. System controller request bus controller to finish current transactions.
3. Bus controller send acknowledge to system controller after completed bus transactions.
4. System controller request memory controller to enter into self refresh mode.
5. System controller wait for self refresh acknowledge from memory controller.
6. Internal reset signals and nRSTOUT are asserted and reset counter is activated.
7. Reset counter is expired then, internal reset signals and nRSTOUT are deasserted.
4.5 WAKEUP
RESET
When S3C2416 is woken up from SLEEP mode by wakeup event, the wakeup reset is invoked. The detail
description will be explained in the power management mode section.
Table 2-1 lists alive registers which are not influenced various reset sources except nRESET. With the exception
of below registers (in table 2-1), All S3C2416’s internal registers are reset by above-mentioned reset sources.
Table 2-1. Registers & GPIO Status in RESET (R: reset, S: sustain previous value)
Region
Registers
Softw
are
Wak
eup
Wa
tchdo
g
nRESET
SYSCON OSCSET , PWRCFG, RSTCON, RSTSTAT, WKUPSTAT, INFORM0,
INFORM1, INFORM2, INFORM3
S S S R
GPIO
GPFCON, GPFUDP, GPFDAT, GPGCON[7:0], GPGUDP,
GPGDAT[7:0], EXTINT0 ~ EXTINT15
R S R R
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...