w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 147

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

CRE7 (GP17, Default 0x01)
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.
WDT_CTRL1* BIT[1]*
Bit 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
Bit 7 - 4: Reserved.
Bit 4 - 3: Select Function.
Bit 2: Reserved.
Bit 1: Polarity: 1: Invert, 0: No Invert
Bit 0: In/Out: 1: Input, 0: Output
General Purpose Read/Write Enable*
Bit 7 - 2: Reserved
Bit 1:
Bit 0:
2). Continuous high or low depends on the polarity bit of GP13 or GP17 configure registers.
= 00 Select Basic I/O function.
= 01 Select 1st alternate function: Power LED output. Please refer to TABLE C
= 1x Reserved
= 1 Enable General Purpose Write Strobe
= 0 Disable General Purpose Write Strobe
= 1 Enable General Purpose Address Decode
= 0 Disable General Purpose Address Decode
1
0
0
0
WDT_CTRL0* BIT[3]
X
0
1
1
- 147 -
WDT_CTRL1 BIT[0]
X
X
0
1
Publication Release Date:April 1998
W83977ATF
1 Hertz Toggle pulse
Continuous high or low*
Continuous high or low*
1 Hertz Toggle pulse
POWER LED STATE
PRELIMINARY
Revision 0.52