Acnodes PCH 7791 - Manual (Page 63)

PCH 7791
17 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
Examp le C code:
outportb(0x4E, 0xE 6); //GP IO I/O sel ection reg.
outportb(0x4 F, 0x0); //0 – normal, 1 - inverted
outportb(0x4E, 0xE 4); //GP IO i nvers ion reg.
outport b(0x4F, 0xFF); //0 – Output, 1 - Input or
outportb(0x4E, 0xE 4); //GP IO inversi on reg.
outportb(0x4 F, 0xF0); //0 – Output, 1 - Input
R ead GPIO value
Examp le x86 assembly code:
mov
mov
dx, 4E h
al, 0 E5h ;GP IO data reg.
out dx, al
mov dx, 4Fh
in al, d x ;B it[3::0] = GP I[3 ::0] val ue
Examp le C code:
outportb(0x4E, 0 xE 5); //GP IO data reg.
GP = inportb(0x4F); //B it[3::0] = GP I[3::0]
Writ e GPIO value
Examp le x86 assembly code:
;Set G PO62
mov dx, 4E h
mov al, 0 E5h ;GP IO data reg.
out dx, al
mov dx, 4Fh
in al, d x
or al, 0 0000100b ;B it2 = G PO62
out dx, al
;Clear GP O62