PCH 7991
19 inch Atom Fanless Panel PC
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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.
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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
;Clear GP O62
