W83977F-A Datasheet, PDF (148/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
CR60, CR 61 (Default 0x00, 0x00)
These two registers select GP2 & Watch Dog I/O base address [0x100:0xFFE] on 2 byte
boundaries. I/O base address + 1 : Watch Dog I/O base address.
CR70 (Default 0x00)
Bit 7-4 : Reserved.
Bit 3-0 : These bits select IRQ resource for Common IRQ of GP20~GP25 at Logic Device 9.
CR71 (Default 0x02)
Bit 7-2 : Reserved.
Bit 1 : IRQLEV -- > IRQ Level
= 1: High; = 0: Low
Bit 0 : IRQTYPE --> IRQ Type
= 1: Level trigger; 0: Edge trigger
CR72 (Default 0x00)
Bit 7-4 : Reserved.
Bit 3-0 : These bits select IRQ resource for Watch Dog.
CR73
Bit 7-2 : Reserved.
Bit 1 : IRQLEV -- > IRQ Level
= 1: High; = 0: Low
Bit 0 : IRQTYPE --> IRQ Type
= 1: Level trigger; = 0: Edge trigger
CRE8 (GP20, Default 0x01)
Bit 7-5 : Reserved.
Bit 4-3 : Select Function.
= 00 Select basic I/O function
= 01 Reserved
= 10 Select alternate function : Keyboard Reset (connected to KBC P20)
= 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
CRE9 (GP21, 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 P13 I/O
= 11 Reserved
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