CAPA831 Intel
®
Atom
TM
D2550/N2800/N2600 Processor 3.5” SBC
Digital I/O
67
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.
CN5
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)
Summary of Contents for CAPA831
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