W83977EF Datasheet, PDF (111/150 Pages) Winbond – WINBOND I/O

W83977EF
0
1
0
Continuous high or low*
0
1
1
1 Hertz Toggle pulse
*Note: 1). Regarding to the contents of WDT_CTR1 and WDT_CTRL0, please refer to CRF3 and CRF4 in Logic Device 8.
2). Continuous high or low depends on the polarity bit of GP13 or GP17 configure registers.
CRF1 ( Default 0x00)
General Purpose Read/Write Enable*
Bit 7 - 2: Reserved
Bit 1:
= 1 Enable GP15 General Purpose Address Decode
= 0 Disable GP15 General Purpose Address Decode
Bit 0:
= 1 Enable GP14 General Purpose Address Decode
= 0 Disable GP14 General Purpose Address Decode
*Note: If the logical device's activate bit is not set then bit 0 and 1 have no effect.
10.8 Logical Device 8 (GP I/O Port II)
CR30 (Default 0x00)
Bit 7 - 1: Reserved.
Bit 0: = 1 Activates the logical device.
= 0 Logical device is inactive.
CR60, CR 61 (Default 0x00, 0x00)
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.
CR70 (Default 0x00)
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for Common IRQ of GP20~GP26 at Logic Device 8.
CR72 (Default 0x00)
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for Watch Dog.
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)
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Publication Release Date: April 2003
Revision 1.1