w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 156

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

CRF1 (Default 0x00)
*Note: If the logical device's activate bit is not set then bit 0 and 1 have no effect.
14.9 Logical Device 8 (GP I/O Port II)
CR30 (Default 0x00)
CR60, CR 61 (Default 0x00, 0x00)
CR70 (Default 0x00)
CR72 (Default 0x00)
CRE8 (GP20, Default 0x01)
Bit 7 - 2
Bit 1
Bit 0
Bit 7 - 1
Bit 0
Bit 7 - 4
Bit 3 - 0
Bit 7 - 4
Bit 3 - 0
Bit 7 - 5
Bit 4 - 3
Bit 2
Bit 1
Bit 0
General Purpose Read/Write Enable*
These two registers select GP2 & Watch Dog I/O base address [0x100:0xFFE] on 2 byte
boundary. I/O base address + 1: Watch Dog I/O base address.
: Reserved
= 1
= 0
= 1
= 0
: Reserved.
= 1
= 0
: Reserved.
: These bits select IRQ resource for Common IRQ of GP20~GP26 at Logic Device 8.
: Reserved.
: These bits select IRQ resource for Watch Dog.
: Reserved.
: Select Function.
= 00
= 01
= 10
= 11
: Int En
= 1
= 0
: Polarity: 1: Invert, 0: No Invert
: In/Out: 1: Input, 0: Output
Enable General Purpose Write Strobe
Disable General Purpose Write Strobe
Enable General Purpose Address Decode
Disable General Purpose Address Decode
Activates the logical device.
Logical device is inactive.
Select basic I/O function
Reserved
Select alternate function: Keyboard Reset (connected to KBC P20)
Reserved
Enable Common IRQ
Disable Common IRQ
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W83977ATF/W83977ATG