W83977F Datasheet, PDF (149/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
CRE7 (GP17, Default 0x01)
PRELIMINARY
Bit 7-4 : Reserved.
Bit 4-3 : Select Function.
= 00 Select Basic I/O function.
= 01 Select 1st alternate function : Power LED output. Please refer to TABLE C
= 1x Reserved
Bit 2 : Reserved.
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
TABLE C
WDT_CTRL1* BIT[1]* WDT_CTRL0* BIT[3] WDT_CTRL1 BIT[0] POWER LED STATE
1
X
X
1 Hertz Toggle pulse
0
0
X
Continuous high or low*
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 General Purpose Write Strobe
= 0 Disable General Purpose Write Strobe
Bit 0 :
= 1 Enable General Purpose Address Decode
= 0 Disable General Purpose Address Decode
*Note : If the logical device s activate bit is not set then bit 0 and 1 have no effect.
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Publication Release Date: March 1998
Revision 0.58