WATCHDOG TIMER
S3C2416X RISC MICROPROCESSOR
11-4
3 WATCHDOG TIMER SPECIAL REGISTERS
3.1 WATCHDOG TIMER CONTROL (WTCON) REGISTER
The WTCON register allows the user to enable/disable the watchdog timer, select the clock signal from 4 different
sources, enable/disable interrupts, and enable/disable the watchdog timer output.
The Watchdog timer is used to resume the S3C2416 restart on malfunction after its power on. At this time,
disable the interrupt generation and enable the Watchdog timer output for reset signal.
If controller restart is not desired and if the user wants to use the normal timer only, which is provided by the
Watchdog timer, enable the interrupt generation and disable the Watchdog timer output for reset signal.
Register
Address
R/W
Description
Reset Value
WTCON 0x53000000
R/W
Watchdog
timer control register
0x8021
WTCON
Bit
Description
Initial State
Prescaler value
[15:8] Prescaler value.
The valid range is from 0 to 255(28-1).
0x80
Reserved [7:6]
Reserved.
These two bits must be 00 in normal operation.
00
Watchdog timer
[5]
Enable or disable bit of Watchdog timer.
0 = Disable
1 = Enable
1
Clock select
[4:3] Determine the clock division factor.
00 = 16
01 = 32
10 = 64
11 = 128
00
Interrupt
generation
[2]
Enable or disable bit of the interrupt.
0 = Disable
1 = Enable
0
Reserved [1]
Reserved.
This bit must be 0 in normal operation.
0
Reset
enable/disable
[0]
Enable or disable bit of Watchdog timer output for reset signal.
1 = Assert reset signal of the S3C2416 at watchdog time-out
0 = Disable the reset function of the watchdog timer.
1
NOTE:
Initial state of ‘Reset enable/disable’ is 1(reset enable). If user do not disable this bit, S3C2416 will be rebooted in
about 5.63sec (In the case of PCLK is 12MHz). So at boot loader, this bit should be disabled before under control of
Operating System, or Firmware.
Содержание S3C2416
Страница 33: ...S3C2416X RISC MICROPROCESSOR PRODUCT OVERVIEW 1 5 3 BLOCK DIAGRAM Figure 1 1 S3C2416X Block Diagram ...
Страница 38: ...PRODUCT OVERVIEW S3C2416X RISC MICROPROCESSOR 1 10 153 AIN 1 U14 195 EINT 10 GPG2 K15 237 SDATA 14 C18 ...
Страница 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Страница 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Страница 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Страница 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Страница 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Страница 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Страница 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Страница 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Страница 455: ...S3C2416X RISC MICROPROCESSOR HSMMC CONTROLLER 20 9 4 9 SD COMMAND ISSUE SEQUENCE Figure 20 9 Timeout Setting Sequence ...
Страница 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Страница 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Страница 653: ...S3C2416X RISC MICROPROCESSOR ELECTRICAL DATA 26 15 Figure 26 14 SDRAM READ WRITE Timing Trp 2 Trcd 2 Tcl 2 DW 16 bit ...
Страница 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...
Страница 672: ...MECHANICAL DATA S3C2416X RISC MICROPROCESSOR 30 2 Figure 27 2 330 FBGA 1414 Package Dimension 2 Bottom View ...