W83627HF Datasheet, PDF (169/185 Pages) Winbond – WINBOND I/O

W83627HF/F
PRELIMINARY
CRF1 (GP20-GP27 data register. Default 0x00)
If a port is programmed to be an output port, then its respective bit can be read/written.
If a port is programmed to be an input port, then its respective bit can only be read.
CRF2 (GP20-GP27 inversion register. Default 0x00)
When set to a '1', the incoming/outgoing port value is inverted.
When set to a '0', the incoming/outgoing port value is the same as in data register.
CRF3 (Default 0x00)
Bit 7 - 4: These bits select IRQ resource for IRQIN1.
Bit 3 - 0: These bits select IRQ resource for IRQIN0.
CRF4 (Reserved)
CRF5 (PLED mode register. Default 0x00)
Bit 7-6: select PLED mode
= 00 Power LED pin is tri-stated.
= 01 Power LED pin is drived low.
= 10 Power LED pin is a 1Hz toggle pulse with 50 duty cycle.
= 11 Power LED pin is a 1/4Hz toggle pulse with 50 duty cycle.
Bit 5-4: Reserved
Bit 3: select WDTO count mode.
= 0 second
= 1 minute
Bit 2: Enable the rising edge of keyboard Reset(P20) to force Time-out event.
= 0 Disable
= 1 Enable
Bit 1-0: Reserved
CRF6 (Default 0x00)
Watch Dog Timer Time-out value. Writing a non-zero value to this register causes the counter
to load the value to Watch Dog Counter and start counting down. If the Bit 7 and Bit 6 are set,
any Mouse Interrupt or Keyboard Interrupt event will also cause the reload of previously-loaded
non-zero value to Watch Dog Counter and start counting down. Reading this register returns
current value in Watch Dog Counter instead of Watch Dog Timer Time-out value.
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Publication Release Date: Jul 1999
Revision 0.53