W83977F Datasheet, PDF (151/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
CRE9 (GP21, Default 0x01)
PRELIMINARY
Bit 7-5 : Reserved
Bit 4-3 : Select Function.
= 00 Select Basic I/O function
= 01 Reserved
= 10 Select 2nd alternate function : Keyboard P13 I/O
= 11 Reserved
Bit 2 : Int En
= 1 Enable Common IRQ
= 0 Disable Common IRQ
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
CREA (GP22, Default 0x01)
Bit 7-5 : Reserved.
Bit 4-3 : Select Function.
= 00 Select Basic I/O function.
= 01 Reserved
= 10 Select 2nd alternate function : Keyboard P14 I/O.
= 11 Reserved
Bit 2 : Int En
= 1 Enable Common IRQ
= 0 Disable Common IRQ
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output¡@¡@
CREB (GP23, Default 0x01)
Bit 7-5 : Reserved.
Bit 4-3 : Select Function.
= 00 Select Basic I/O function
= 01 Reserved
= 10 Select 2nd alternate function : Keyboard P15 I/O
= 11 Reserved
Bit 2 : Int En
= 1 Enable Common IRQ
= 0 Disable Common IRQ
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output¡@
- 139 -
Publication Release Date: March 1998
Revision 0.58