W83977F-A Datasheet, PDF (124/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
11.2.3 Power LED
The Power LED function provides 1 Hertz rate toggle pulse output with 50 percent duty cycle. Table
11.2.2 shows how to enable Power LED.
Table 11.2.2
WDT_CTRL1 BIT[1]
1
0
WDT_CTRL0 BIT[3]
X
0
WDT_CTRL1 BIT[0]
X
X
POWER LED STATE
1 Hertz Toggle pulse
Continuous high or low *
0
1
0
Continuous high or low *
0
1
1
1 Hertz Toggle pulse
* Note: Continuous high or low depends on the polarity bit of GP13 or GP17 configure registers.
11.2.4 General Purpose Address Decoder
General Purpose Address Decoder provides two address decode as AEN equal to logic 0. The
address base is stored at CR62, CR63 of logical device 7. The decode output is normally active low.
Users can alter its polarity through the polarity bit of the GP14's configuration register.
11.2.5 General Purpose Write Strobe
General Purpose Write Strobe is an address decoder that performs like General Purpose Address
Decoder, but it has to be qualified by IOW and AEN. Its output is normally active low. Users can
alter its polarity through the polarity bit of the GP15's configuration register.
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