AXIOMTEK EP100, Руководство пользователя

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EP100 AMD Embedded G-Series Processor EPIC Board with LVDS
Digital I/O 59
Appendix B
Digital I/O
About Digital I/O
The onboard digital I/O has 8 bits (DIO0~7). 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 3 inputs and 5 outputs where all of these pins are set to
1.
CN8
Digital I/O Programming
Assembly sample code :
Set functionality:
;Start set DIO program:
mov
dx,2Eh
mov al,87h ;Un-lock super I/O
out dx,al
out dx,al
mov
dx,2Eh
mov al,07h
out dx,al
mov dx,2Fh
mov al,08h
out dx,al
mov
dx,2Eh
mov al,30h
out dx,al
mov dx,2Fh
mov al,02h
out dx,al
Pin Signal Pin Signal
1 DI0 (Bit0) 2 DO0 (Bit 3)
3 DI1 (Bit1) 4 DO1 (Bit 4)
5 DI2 (Bit2) 6 DO2 (Bit 5)
7 GND 8 DO3 (Bit 6)
9 GND 10 DO4 (Bit 7)