w83795g Winbond Electronics Corp America, w83795g Datasheet - Page 41

• Manufacturer Part Number: w83795g
• Description: Nuvoton H/w Monitor
• Manufacturer: Winbond Electronics Corp America

W83795G/ADG
W83795G/ADG starts to count down, and the host should set the timer for further count down or
clear/disable the timer to prevent the W83795G/ADG from issuing reset signals.
Watch Dog Timer consists of four registers. WDT LOCK (Bank0, CR0C) and WDT ENABLE (Bank0,
CR0D) are used to activate Soft-WDT and Hard-WDT, respectively. WDT STS (Bank0, CR0E) and
WDT TIMER (Bank0, CR0F) can inform the host whether the system time is up or not.
Two kinds of watchdog timer functions are supported by the W83795G/ADG. One is so-called Soft
Watch Dog Timer, and the other is Hard Watch Dog Timer.
Hard Watch Dog timer, if enabled, will start a 4-minute WDT after the system reset is completed. (A
low-to-high transition on SYSRSTIN# pin). BIOS needs to write a 00
into WDT TIMER (Bank0,
HEX
CR0F) to disable the timer within 4 minutes. Otherwise, WDTRST# will assert to reset the system.
Soft Watch Dog Timer will start counting down whenever Timeout Time is set and Soft Watch Dog
Timer is enabled. WDTRST# will be issued when the time runs out.
Soft Watch Dog Timer will be disabled automatically after receiving SYSRSTIN # low signal.
WDT ENABLE (Bank0, CR0D [2]/ENWDT) must be set to 1 if wish to program the four Watch Dog
Timer Registers.
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Aug/2/2010
Revision 1.41