w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 125

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

CRF0 (Default 0x00)
Debounce Filter Enable or Disable for General Purpose I/O Combined Interrupt. The Debounce Filter
can reject a pulse with 1ms width or less.
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 reloading of the non-zero value to Watch Dog
Counter and count down. If this register is read, Watch Dog Timer Time-out value can not be
accessed but the current value in Watch Dog Counter can be accessed.
CRF3 (WDT_CTRL0, Default 0x00)
Bit 7 - 4: Reserved
Bit 3: GP Common IRQ Filter Select
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.
= 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
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Publication Release Date: March 1999
W83977EF/ CTF
PRELIMINARY
Revision A1