W83977A Winbond Electronics Corp America, W83977A Datasheet - Page 120

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

CRE4 (GP14, Default 0x01)
CRE5 (GP15, Default 0x01)
CRE6 (GP16, Default 0x01)
CRE7 (GP17, Default 0x01)
Bit 7 - 5: Reserved.
Bit 4 - 3: Select Function.
Bit 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 5: Reserved.
Bit 4 - 3: Select Function.
Bit 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 5: Reserved.
Bit 4 - 3: Select Function.
Bit 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 4: Reserved.
Bit 4 - 3: Select Function.
Bit 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
= 00 Select Basic I/O function.
= 01 Select 1st alternate function: General Purpose Address Decoder(Active Low when
= 10 Select 2nd alternate function: Keyboard Inhibit(P17).
= 11 Reserved
= 00 Select Basic I/O function.
= 01 General Purpose Write Strobe(Active Low when Bit 1 = 0).
= 10 8042 P12.
= 11 Reserved
= 00 Select Basic I/O function.
= 01 Select 1st alternate function:
= 1x Reserved
= 00 Select Basic I/O function.
= 01 Select 1st alternate function: Power LED output. Please refer to TABLE C
= 1x Reserved
Bit 1 = 0, Decode two byte address).
-109-
Watch Dog
Timer Output.
Publication Release Date: March 1998
W83977TF
PRELIMINARY
Revision 0.62