W83977A Winbond Electronics Corp America, W83977A Datasheet - Page 127

• Manufacturer Part Number: W83977A
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

CRE4 (GP34, Default 0x01)
CRE5 (GP35, Default 0x01)
CRE6 (GP36, Default 0x01)
CRE7 (GP37, Default 0x01)
CRF1 ( Default 0x00)
*Note: If the logical device's activate bit is not set then bit 0 and 1 have no effect.
Bit 2: Reserved.
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: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 3: Reserved
Bit 2: SERIRQ
Bit 1:
Bit 0:
= 1 Select Alternate Function: Watch Dog Timer output.
= 0 Select Basic I/O Function.
= 0 The IRQ system is in normal mode.
= 1 The IRQ system is in serial IRQ mode.
= 1 Enable GP33 General Purpose Address Decode.
= 0 Disable GP33 General Purpose Address Decode.
= 1 Enable GP32 General Purpose Address Decode.
= 0 Disable GP32 General Purpose Address Decode.
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Publication Release Date: March 1998
W83977TF
PRELIMINARY
Revision 0.62