W83792G Nuvoton Technology Corporation of America, W83792G Datasheet - Page 35

• Manufacturer Part Number: W83792G
• Description: IC MONITOR H/W 48-LQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83792G

• Function: Hardware Monitor
• Topology: ADC, Fan Control, Register Bank
• Sensor Type: External
• Sensing Temperature: External Sensor
• Output Type: I²C™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8. CONTROL AND STATUS REGISTER
8.1
Reset Condition: Resume reset
Two kinds of watchdog timer function are supported by W83792D/G. One is so-called Soft Watch Dog
Timer, and the other is Hard Watch Dog Timer.
Hard Watch Dog timer if enabled which will start a 4 minutes WDT after completion of system reset. (A
Low to High transition on SYSRSTIN# pin). BIOS need to write a 00 into Watch Dog Timer Register
(04h) to disable timer within 4 minutes, otherwise pin 47 WDTRST# will assert to reset system.
Soft Watch Dog Timer will start to down counting whenever Timeout Time is set and Soft Watch Dog
Timer is enabled. A WDTRST# will be issued while the timer timeouts.
Soft Watch Dog Timer will be disabled automatically after received a SYSRSTIN_N low signal.
To write these registers requires CR40[4]/ENWDT being asserted.
CR01 LOCK Watch Dog
CR02 Watch Dog Enable
Watch Dog Enable
Watch Dog Status
LOCK Watch Dog
Watch Dog Timer
7~0
7~2
1
0
BIT
BIT
MNEMONIC
Watch Dog Timer Registers --- Index 01h-04h
Unlock
Code
reserve
HARD
SOFT
NAME
NAME
BANK INDEX ATTR BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
ATTRIBUTE
ATTRIBUTE
0
0
0
0
WO
RO
RO
RO
1
2
3
4
R/W
R/W
WO
RO
Write 55h, Enable Soft Watch Dog Timer.
Wire AAh, Disable Soft Watch Dog Timer.
Write 33h, Enable Hard Watch Dog Timer.
Write CCh, Disable Hard Watch Dog Timer.
reserve
1 indicates the Hard Watch Dog is enabled; 0, Hard Watch
Dog is disabled.
1 indicates the Soft Watch Dog is enabled; 0, Soft Watch Dog
is disabled.
- 29 -
Reserve
0
Reserve
0-
DESCRIPTION
DESCRIPTION
00h (Unit in min)
Timeout Time
Publication Release Date: April 26, 2006
Unlock Code
W83792AD/AG/D/G
WDT Stage HARD_TO SOFT_TO
0
HARD
BIT 1
0
0
Revision 0.9
SOFT
BIT 0
0
0