W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 151

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

CRF4 (WDT_CTRL1, Default 0x00)
*Note : 1). Internal logic provides an 1us Debounce Filter to reject the width of P20 pulse less than 1us.
Bit 3 : When Time-out occurs, Enable or Disable Power LED with 1 Hz and 50% duty cycle output.
= 1 Enable
= 0 Disable
Bit 2 : Mouse interrupt reset Enable or Disable
= 1 Watching Dog Timer is reset upon a Mouse interrupt
= 0 Watching Dog Timer is not affected by Mouse interrupt
Bit 1 : Keyboard interrupt reset Enable or Disable
= 1 Watching Dog Timer is reset upon a Keyboard interrupt
= 0 Watching Dog Timer is not affected by Keyboard interrupt
Bit 0 : Reserved.
Watching Dog Timer Control Register #1
Bit 7-4 : Reserved
Bit 3 : Enable the rising edge of Keyboard Reset(P20) to force Time-out event, R/W*
= 1 Enable
= 0 Disable
Bit 2 : Force Watching Dog Timer Time-out, Write only*
= 1 Force Watching Dog Timer time-out event; this bit is self-clearing.
Bit 1 : Enable Power LED 1Hz rate toggle pulse with 50% duty cycle , R/W
= 1 Enable
= 0 Disable
Bit 0 : Watching Dog Timer Status, R/W
= 1 Watching Dog Timer time-out occurred.
= 0 Watching Dog Timer counting
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
2). The P20 signal that coming from Debounce Filter is ORed with the signal generated by the Force Time-out bit and
then connect to set the Bit 0(Watching Dog Timer Status). The ORed signal is self-clearing.
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Publication Release Date: May 2006
Revision 0.60