W83977F Datasheet, PDF (148/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
CRE3 (GP13, Default 0x01)
PRELIMINARY
Bit 7-5 : Reserved.
Bit 4-3 : Select Function.
= 00 Select Basic I/O function.
= 01 Select 1st alternate function : Power LED output.
= 10 Reserved
= 11 Reserved
Bit 2 : Reserved.
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
CRE4 (GP14, Default 0x01)
Bit 7-5 : Reserved.
Bit 4-3 : Select Function.
= 00 Select Basic I/O function.
= 01 Select 1st alternate function : General Purpose Address Decoder(Active Low when
Bit 1 = 0, Decode two byte address).
= 10 Select 2nd alternate function : Keyboard Inhibit(P17).
= 11 Reserved
Bit 2 : Reserved.
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
CRE5 (GP15, Default 0x01)
Bit 7-5 : Reserved.
Bit 4-3 : Select Function.
= 00 Select Basic I/O function.
= 01 General Purpose Write Strobe(Active Low when Bit 1 = 0).
= 10 8042 P12.
= 11 Reserved
Bit 2 : Reserved.
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
CRE6 (GP16, Default 0x01)
Bit 7-5 : Reserved.
Bit 4-3 : Select Function.
= 00 Select Basic I/O function.
= 01 Select 1st alternate function : Watching Dog Timer Output.
= 1x Reserved
Bit 2 : Reserved.
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
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Publication Release Date: March 1998
Revision 0.58