W83977A Winbond Electronics Corp America, W83977A Datasheet - Page 121

• Manufacturer Part Number: W83977A
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

TABLE C
*Note: 1). Regarding to the contents of WDT_CTR1 and WDT_CTRL0, please refer to CRF3 and CRF4 in Logic Device 8.
CRF1 ( Default 0x00)
*Note: If the logical device's activate bit is not set then bit 0 and 1 have no effect.
11.8 Logical Device 8 (GP I/O Port II)
CR30 (Default 0x00)
CR60, CR 61 (Default 0x00, 0x00)
CR70 (Default 0x00)
CR72 (Default 0x00)
WDT_CTRL1* BIT[1]*
General Purpose Read/Write Enable*
Bit 7 - 2: Reserved
Bit 1:
Bit 0:
Bit 7 - 1: Reserved.
Bit 0: = 1 Activates the logical device.
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.
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for Common IRQ of
Bit 7 - 4: Reserved.
Bit 3 - 0: These bits select IRQ resource for Watch Dog.
2). Continuous high or low depends on the polarity bit of GP13 or GP17 configure registers.
= 1 Enable General Purpose Write Strobe
= 0 Disable General Purpose Write Strobe
= 1 Enable General Purpose Address Decode
= 0 Disable General Purpose Address Decode
= 0 Logical device is inactive.
1
0
0
0
WDT_CTRL0* BIT[3]
X
0
1
1
-110-
WDT_CTRL1 BIT[0]
GP20~GP26
X
X
0
1
Publication Release Date: March 1998
1 Hertz Toggle pulse
Continuous high or low*
Continuous high or low*
1 Hertz Toggle pulse
at Logic Device 8.
W83977TF
POWER LED STATE
PRELIMINARY
Revision 0.62