w83977f Winbond Electronics Corp America, w83977f Datasheet - Page 152
w83977f
Manufacturer Part Number
w83977f
Description
Plug & Play 1.0a Compliant
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83977F.pdf
(181 pages)
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Part Number:
w83977f-A
Manufacturer:
VIA
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906
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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)
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
- 140 -
W83977F/ W83977AF
Publication Release Date: March 1998
PRELIMINARY
Revision 0.58
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