Acnodes PCH 7991 - Manual (Page 62)

PCH 7991
19 inch Atom Fanless Panel PC
© Copyright 2012 Acnodes, Inc.
All rights reserved. Product description and product specifications
are subject to change without notice. For latest product information,
please visit Acnodes’ web site at www.acnodes.com. 14628 Central Ave.
Chino, CA91710
Tel:909.597.7588, Fax:909.597.1939
Activate the logic device
Examp le x86 assembly code:
mov dx, 4E h
mov al, 0 30 h ; Logic device a ctivation control reg.
out dx, al
mov dx, 4Fh
in al, d x
or al, 004h ;S et bit2 to enable G PIO P ort6 if LDN =8
or al, 002h ;S et bit1 to enable G PIO P ort2 if LDN =9
out dx, al
E xample C code:
outportb(0x4E, 0x30); //Logic de vice activa tion control
outportb(0x4 F, (inportb(0x4F)|0x2));
//S et bit[1] to enable GP IO P ort2 if LDN= 9
Or
outportb(0x4E, 0x30); //Logic de vice activa tion control
outportb(0x4 F, (inpo rtb(0x4F)|0x4));
//S et bit[2] to enable GP IO P ort6 if LDN= 8
C onfigure GPIO register
Examp le x86 assembly code:
mov dx, 4E h
mov al, 0 E6h ;GP IO inversion reg.
out dx, al
mov dx, 4Fh
mov al, 000h ;0 – normal, 1 - inverted
out dx, al
mov dx, 4E h
mov al, 0 E4h ;GP IO I/O selecti on reg.
out dx, al
mov dx, 4Fh
mov al, 0FFh ;0 – O utput, 1 – Input
;or mov a l, 0F0h to set output
out dx, al