PRELIMINARY
Watchdog Timer
S3C6400 RISC MICROPROCESSOR
34-4
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.
WATCHDOG TIMER DATA (WTDAT) REGISTER
The WTDAT register is used to specify the time-out duration. The content of WTDAT cannot be automatically
loaded into the timer counter at initial watchdog timer operation. However, using 0x8000 (initial value) will drive
the first time-out. In this case, the value of WTDAT will be automatically reloaded into WTCNT.
Register
Address
R/W
Description
Reset Value
WTDAT 0x7E004004
R/W
Watchdog timer data register
0x8000
WTDAT
Bit
Description
Initial State
Count reload value
[15:0]
Watchdog timer count value for reload.
0x8000
WATCHDOG TIMER COUNT (WTCNT) REGISTER
The WTCNT register contains the current count values for the watchdog timer during normal operation.
Note
: The content of the WTDAT register cannot be automatically loaded into the timer count register when the
watchdog timer is enabled initially, so the WTCNT register must be set to an initial value before enabling it.
Register
Address
R/W
Description
Reset Value
WTCNT 0x7E004008
R/W
Watchdog
timer count register
0x8000
WTCNT
Bit
Description
Initial State
Count value
[15:0]
The current count value of the watchdog timer
0x8000
WATCHDOG TIMER INTERRUPT CLEAR (WTCLRINT) REGISTER
The WTCLRINT register is used to clear the interrupt. Interrupt service routine is responsible for clearing the
relevant interrupt after the interrupt service is completed. Writing any values on this register clears the interrupt.
Reading this register is not allowed.
Register
Address
R/W
Description
Reset Value
WTCLRINT
0x7E00400c
W
Watchdog timer interrupt clear register
-
WTCLRINT
Bit
Description
Initial State
Interrupt clear
[0]
Write any values clears the interrupt
-