W83977EF-AW datasheet(100/142 Pages) WINBOND

Part #	W83977EF-AW

Description	WINBOND ISA I/O

Download	142 Pages

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Manufacturer	WINBOND [Winbond]

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W83977EF-AW/W83977EG-AW

-98-

12.7 Logical Device 7 (GP I/O Port I)

CR30 (Default 0x00)

Bit 7 - 1: Reserved.

Bit 0: = 1 Activates the logical device.

= 0 Logical device is inactive.

CR60, CR 61 (Default 0x00, 0x00)

These two registers select GP1 I/O base address [0x100:0xFFF] on 1 byte boundary.

CR62, CR 63 (Default 0x00, 0x00)

These two registers select GP14 alternate function Primary I/O base address [0x100:0xFFx] on

1~8 byte boundary; They are available as you setting GP14 to be an alternate function (General

Purpose Address Decode).

CR64, CR 65 (Default 0x00, 0x00)

These two registers select GP15 alternate function Primary I/O base address [0x100:0xFFx] on

1~8

byte boundary; They are available as you setting GP15 to be an alternate function (General

Purpose Address Decode).

CR70 (Default 0x00)

Bit 7 - 4: Reserved.

Bit 3 - 0: These bits select IRQ resource for GP10 as you setting GP10 to be an alternate function

(Interrupt Steering).

CR72 (Default 0x00)

Bit 7 - 4: Reserved.

Bit 3 - 0: These bits select IRQ resource for GP11 as you setting GP11 to be an alternate function

(Interrupt Steering).

CRE0 (GP10, Default 0x01)

Bit 7 - 5: Reserved.

Bit 4: IRQ Filter Select

= 1 Debounce Filter Enabled

= 0 Debounce Filter Bypassed

Bit 3: Select Function.

= 1 Select Alternate Function: Interrupt Steering.

= 0 Select Basic I/O Function.

Bit 2: Reserved.

Bit 1: Polarity.

= 1 Invert.

= 0 No Invert.

Bit 0: In/Out selection.

= 1 Input.

= 0 Output.

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