w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 152
w83977atf
Manufacturer Part Number
w83977atf
Description
Winbond I/o
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W83977ATF.pdf
(207 pages)
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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).
- 152 -
Publication Release Date:April 1998
W83977ATF
PRELIMINARY
Revision 0.52
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