W83977EF Winbond Electronics Corp America, W83977EF Datasheet - Page 113

• Manufacturer Part Number: W83977EF
• Description: Description = W83877TF Plus Kbc, GP I/O, Wake-Up, Power Fail Resume ;; Package = QFP 128
• Manufacturer: Winbond Electronics Corp America

CREC (GP24, Default 0x01)
CRED (GP25, Default 0x01)
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 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.
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 5: Reserved.
Bit 4 - 3: Select Function.
Bit 2: Int En
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 4: Reserved.
Bit 3: Select Function.
Bit 2: Int En
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 4: Reserved
Bit 3: GP Common IRQ Filter Select
Bit 2 - 0: Reserved
= 00 Select Basic I/O function
= 01 Reserved
= 10 Select 2nd alternate function: Keyboard P16 I/O
= 11 Reserved
= 1
= 0
= 1 Select alternate function: GATE A20(Connect to KBC P21).
= 0 Select basic I/O function
= 1
= 0
= 1 Debounce Filter Enabled
= 0 Debounce Filter Bypassed
Enable Common IRQ
Disable Common IRQ
Enable Common IRQ
Disable Common IRQ
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Publication Release Date: April 2003
W83977EF
Revision 1.1