W83L517D Datasheet, PDF (129/138 Pages) Winbond – LPC SUPER I/O

CRF0 (GP10-GP17 I/O selection register. Default 0xFFh)
When set to a '1', respective GPIO port is programmed as an input port.
When set to a '0', respective GPIO port is programmed as an output port.
W83L517D
Version 0.6
CRF1 (GP10-GP17 data register. Default 0x00h when the port is active, otherwise 0xFF)
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 (GP10-GP17 inversion register. Default 0x00h when the port is active, otherwise 0xFF)
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.
Logical Device 9 (GPIO Port 3 ~ GPIO Port 5 )
CR30 (Default 0x00h)
Bit 7 ~ 3: Reserved.
Bit 2: = 1 Activate GPIO5.
= 0 GPIO5 is inactive
Bit 1: = 1 Activate GPIO4.
= 0 GPIO4 is inactive
Bit 0: = 1 Activate GPIO3.
= 0 GPIO3 is inactive.
CR60,61(Default 0x00h,0x00h).
These two registers select the GP 3,4,5 base address(0x100h : FFFh) ON 3 bytes boundary.
IO address : CRF1 base address
IO address + 1 : CRF3 base address
IO address + 2 : CRF7 base address
CRF0 (GP3 I/O selection register. Default 0xFFh )
When set to a '1', respective GPIO port is programmed as an input port.
When set to a '0', respective GPIO port is programmed as an output port.
CRF1 (GP3 data register. Default 0x00h when the port is active, otherwise 0xFFh )
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 (GP3 inversion register. Default 0x00h when the port is active, otherwise 0xFFh)
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.
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Publication Release Date: Apr. 2000
Revision 0.60