Appendix E Digital I/O Interface; Introduction; Assembly Language Sample 1; Assembly Language Sample 2 - IEI Technology AESQ170-969 User Manual

Appendix E Digital I/O Interface

E.1 Introduction
The DIO connector on the AESQ170-969 is interfaced to GPIO ports on the
Super I/O chipset. The digital inputs and digital outputs are generally control
signals that control the on/off circuit of external devices or TTL devices. Data
can be read or written to the selected address to enable the DIO functions.
NOTE:
For further information, please refer to the datasheet for the Super
I/O chipset.
The BIOS interrupt call INT 15H controls the digital I/O.
INT 15H:
AH – 6FH
Sub-function:
AL – 8 :Set the digital port as INPUT
AL :Digital I/O input value
E.2 Assembly Language Sample 1
MOV AX, 6F08H
INT 15H
AL low byte = value
AH – 6FH
Sub-function:
AL – 9 :Set the digital port as OUTPUT
BL :Digital I/O input value
E.3 Assembly Language Sample 2
MOV AX, 6F09H
;setting the digital port as input
;
;setting the digital port as output
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Appendix E Digital I/O Interface