User`s manual

CT-XBT0x Mini-ITX Motherboard
29
Registers Description
GPIO Input/Output Select
 GPIO8x Configuration Registers
(Index port=0xA00, Data port=0xA01, Offset=0x88)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GPO3 GPO2 GPO1 GPO0 GPI3 GPI2 GPI1 GPI0
Note.
Bit X = 0 means Input Mode
Bit X = 1 means Output Mode
GPIO Output Data Select
z GPIO Output Data Register
(Index port=0xA00, Data port=0xA01, Offset=0x89)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
GPO3 GPO2 GPO1 GPO0 GPI3 GPI2 GPI1 GPI0
Note.
Bit X = 0 outputs 0 when in output mode
Bit X = 1 outputs 1 when in output mode