W83977G-A Nuvoton Technology Corporation of America, W83977G-A Datasheet - Page 150

• Manufacturer Part Number: W83977G-A
• Description: IC I/O CONTROLLER 128-PQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83977G-A

• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CRED (GP25, Default 0x01)
CRF0 (Default 0x00)
Debounce Filter Enable or Disable for General Purpose I/O Combined Interrupt. The Debounce Filter
can reject a pulse with 1ms width or less.
CRF1 (Reserved)
CRF2 (Default 0x00)
Watching Dog Timer Time-out value. Writing a non-zero value to this register causes the counter to
load the value to Watching Dog Counter and start to count down. If the Bit2 and Bit 1 are set, any
Mouse Interrupt or Keyboard Interrupt happen will also cause to reload the non-zero value to
Watching Dog Counter and count down. Read this register can not access Watching Dog Timer
Time-out value, but can access the current value in Watching Dog Counter.
CRF3 (WDT_CTRL0, Default 0x00)
Bit 2 : Int En
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
Bit 7-4 : Reserved.
Bit 3 : Select Function.
= 1 Select alternate function: GATE A20(Connect to KBC P21).
= 0 Select basic I/O function
Bit 2 : Int En
= 1
= 0
Bit 1 : Polarity : 1 : Invert, 0 : No Invert
Bit 0 : In/Out : 1 : Input, 0 : Output
Bit 7-4 : Reserved
Bit 3 : GP Common IRQ Filter Select
Bit 2-0 : Reserved
Bit 7-0 :
= 0x03 Time-out occurs after 3 minutes
= 0xFF Time-out occurs after 255 minutes
Watching Dog Timer Control Register #0
Bit 7-4 : Reserved
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
Enable Common IRQ
Disable Common IRQ
= 1
= 0
= 1 Debounce Filter Enabled
= 0 Debounce Filter Bypassed
= 0x00 Time-out Disable
= 0x01 Time-out occurs after 1 minute
= 0x02 Time-out occurs after 2 minutes
................................................
Enable Common IRQ
Disable Common IRQ
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