w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 121

• Manufacturer Part Number: w83977ctf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

CRE5 (GP15, Default 0x01)
CRE6 (GP16, Default 0x01)
CRE7 (GP17, Default 0x01)
Bit 7 - 6:
Bit 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 Address decoder is 1-Byte boundary.
= 01 Address decoder is 2-Byte boundary.
= 10 Address decoder is 4-Byte boundary.
= 11 Address decoder is 8-Byte boundary.
= 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: Watch Dog Timer Output.
= 1x Reserved
= 00 Select Basic I/O function.
= 01 Select 1st alternate function: Power LED output. Please refer to TABLE C
= 1x Reserved
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Publication Release Date: March 1999
W83977EF/ CTF
PRELIMINARY
Revision A1