w83977eg Winbond Electronics Corp America, w83977eg Datasheet - Page 106

• Manufacturer Part Number: w83977eg
• Description: Winbond Isa I/o W83977ef W83977eg
• Manufacturer: Winbond Electronics Corp America

CRF1 (Reserved)
CRF2 (Default 0x00)
Watch Dog Timer Time-out value. Writing a non-zero value to this register causes the counter to load
the value to Watch Dog Counter and start to count down. If the Bit2 and Bit 1 are set, any Mouse
Interrupt or Keyboard Interrupt happen will also cause to reload the non-zero value to Watch Dog
Counter and count down. Read this register can not access Watch Dog Timer Time-out value, but
can access the current value in Watch Dog Counter.
CRF3 (WDT_CTRL0, Default 0x00)
CRF4 (WDT_CTRL1, Default 0x00)
Bit 2 - 0: Reserved
Bit 7 - 0:
Watch Dog Timer Control Register #0
Bit 7 - 4: Reserved
Bit 3: When Time-out occurs, Enable or Disable Power LED with 1 Hz and 50% duty cycle output.
Bit 2: Mouse interrupt reset Enable or Disable
Bit 0: Reserved.
Watch Dog Timer Control Register #1
Bit 7: Reserved
Bit 6:
Bit 5-4: Power LED toggle pulse frequency select
= 1 Debounce Filter Enabled
= 0 Debounce Filter Bypassed
= 0x00 Time-out Disable
= 0x01 Time-out occurs after 1 minute/second
= 0x02 Time-out occurs after 2 minutes/seconds
= 0x03 Time-out occurs after 3 minutes/seconds
................................................
= 0xFF Time-out occurs after 255 minutes
= 1 Enable
= 0 Disable
= 1 Watch Dog Timer is reset upon a Mouse interrupt
= 0 Watch Dog Timer is not affected by Mouse interrupt
Bit 1: Keyboard interrupt reset Enable or Disable
= 1 Watch Dog Timer is reset upon a Keyboard interrupt
= 0 Watch Dog Timer is not affected by Keyboard interrupt
= 1 Watch Dog counter counts in seconds.
= 0 Watch Dog counter counts in minutes.
= 00 Power LED toggle pulse frequency is 1Hz
W83977EF-AW/W83977EG-AW
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