w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 150

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

CRED (GP25, Default 0x01)
CREE (GP26, 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)
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the value to
Interrupt or Keyboard Interrupt will also cause reloading of the non-zero value to
and count down. Reading this register can not access
access the current value in
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 - 3: Reserved.
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
Bit 7 - 0:
= 1 Select alternate function: GATE A20(Connect to KBC P21).
= 0 Select basic I/O function
= 1
= 0
= 1
= 0
= 1 Debounce Filter Enabled
= 0 Debounce Filter Bypassed
= 0x00 Time-out Disable
= 0x01 Time-out occurs after 1 minute
= 0x02 Time-out occurs after 2 minutes
= 0x03 Time-out occurs after 3 minutes
................................................
= 0xFF Time-out occurs after 255 minutes
Timer Time-out value. Writing a non-zero value to this register causes the counter to load
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Enable Common IRQ
Disable Common IRQ
Enable Common IRQ
Disable Common IRQ
Counter and start to count down. If the Bit2 and Bit 1 are set, any Mouse
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Counter.
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Publication Release Date:April 1998
Timer Time-out value, but can
W83977ATF
PRELIMINARY
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Revision 0.52
Counter