IEI Technology TANK -870-Q170 S eries, Руководство пользователя, Страница: 139 / 143

TANK -870-Q170 E mbedded S ys tem
Page 126
E .1 Introduction
The DIO connector on the TANK-870-Q170 Series 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.
The BIOS interrupt call INT 15H controls the digital I/O.
INT 15H:
AH – 6FH
AL – 8 :Set the digital port as INPUT
Sub-function:
AL :Digital I/O input value