w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 152

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

CR64, CR 65 (Default 0x00, 0x00)
Address Decode).
CR70 (Default 0x00)
CR72 (Default 0x00)
CRE0 (GP30, Default 0x01)
CRE1 (GP31, Default 0x01)
These two registers select GP33 alternate function Primary I/O base address [0x100:0xFFF] on 2-
byte boundary; they are available as you set GP33 to be an alternate function (General Purpose
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for GP30 as you set GP30 to be an alternate function
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for GP31 as you set GP31 to be an alternate function
Bit 7 - 5: Reserved.
Bit 4: IRQ Filter Select
Bit 3: Select Function.
Bit 2: Reserved.
Bit 1: Polarity.
Bit 0: In/Out selection.
Bit 7 - 5: Reserved.
Bit 4: IRQ Filter Select
Bit 3: Select Function.
Bit 2: Reserved.
Bit 1: Polarity.
Bit 0: In/Out selection.
= 1 Debounce Filter Enabled.
= 0 Debounce Filter Bypassed.
= 1 Select Alternate Function: Interrupt Steering.
= 0 Select Basic I/O Function.
= 1 Invert.
= 0 No Invert.
= 1 Input.
= 0 Output.
= 1 Debounce Filter Enabled
= 0 Debounce Filter Bypassed
= 1 Select Alternate Function: Interrupt Steering.
= 0 Select Basic I/O Function.
= 1 Invert.
= 0 No Invert.
= 1 Input.
= 0 Output.
(Interrupt Steering).
(Interrupt Steering).
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Publication Release Date:April 1998
W83977ATF
PRELIMINARY
Revision 0.52