Pch 7991 – Acnodes PCH 7991 User Manual
Page 64
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
mov
dx, 4Eh
mov
al, 0 E5h
;GPIO data reg.
out
dx, al
mov
dx, 4Fh
in
al, d x
and
al, not 00000100b out
dx, al
Examp le C code:
//Set GPO62
outportb(0x4E, 0xE5);
//GPIO data re g.
Outportb(0x4F, (inportb(0x4F)|0x4));
//Set Bit[2]
//Clear GPO62
outportb(0x4E, 0xE5);
//GPIO data re g.
Outportb(0x4F, (inportb(0x4F)&0x FB)); //C lear Bit [2]
The foll ow ings are C language source code:
#include "stdio.h"
#include "conio .h"
//Super I/O index acc ess port
#def ine INDEXP
0x4E
#def ine DATAP
0x4F
//Enter super I/O programming mode
#def ine EN TERPRG {
\
outportb(INDEXP, 0x87); \
outportb(INDEXP, 0x87);