Appendix B Digital I/O; B.1 About Digital I/O; B.2 Digital I/O Programming - AXIOMTEK PICO50R User Manual

B.1 About Digital I/O

The onboard GPIO or digital I/O has 4 bits (DIO1~4). Each bit can be set to function as input or
output by software programming. In default, all pins are pulled high with +5V level (according
to main power). The BIOS default settings are 2 inputs and 2 outputs.
CN2
CN5
CN7
CN10 CN11

B.2 Digital I/O Programming

Assembly sample code :
mov dx,fa31
mov al,00
out dx,al
mov dx,fa32
mov al,0c
out dx,al
mov dx,fa31
mov al,0f
out dx,al
mov dx,fa32
in al,dx
mov dx,fa31
mov al,03
out dx,al
mov dx,fa32
mov al,08
out dx,al
in al,dx
Digital I/O
JP1
CN1
CN3
SW1
CN6
BAT1
CN14
CN12 CN13
; Set DIO 0-3 to Output
; Set DIO 2-3 to High
; Set DIO 0-3 to Input
; Get DIO 0-3 status
; Set DIO 0-1 to Input, 2-3 to Output
; al = 03 => 00000011
; Set DIO 3 to High
; al = 08 => 00001000
; Get DIO 0-2 status
PICO50R/51R Pico-ITX Board
Appendix B
Digital I/O
CN4
Pin Signal
CN8
1 DIO 0
3 DIO 1
CN9
5 +5V
CN14
Pin Signal
2 DIO 3
4 DIO 2
6 GND
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