Pc 6408, B. digital i/o interface, B.1 introduction – Acnodes PC 6408 User Manual

Page 92: B.2 dio connector pinouts, B.3 assembly language samples

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PC 6408

8” Fanless Panel PC

B. DIGITAL I/O INTERFACE

B.1 INTRODUCTION

The DIO connector on the PC5153/ PC5173 is interfaced to GPIO ports on the Super I/O chipset. The

DIO has both 4-bit digital inputs and 4-bit digital outputs. 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.

B.2 DIO CONNECTOR PINOUTS

The following table describes how the DIO connector pins are connected to the Super I/O.

B.3 ASSEMBLY LANGUAGE SAMPLES

B.3.1 ENABLE THE DIO INPUT FUNCTION
The BIOS interrupt call INT 15H controls the digital I/O. An assembly program to enable digital I/O input

functions is listed below.

MOV AX, 6F08H Sets the digital port as input

INT

15H Initiates the INT 15H BIOS call