IEI Technology WAFER-BW-N4-R10 User Manual

Contents

WAFER-BW SBCPage 115The DIO connector on the WAFER-BW is interfaced to GPIO ports on the Super I/Ochipset. The DIO has both 8-bit digital inputs and 8-bit digital outputs. The digital inputsand digital outputs are generally control signals that control the on/off circuit of externaldevices or TTL devices. Data can be read or written to the selected address to enable theDIO functions.NOTE:For further information, please refer to the datasheet for the Super I/Ochipset.The BIOS interrupt call INT 15H controls the digital I/O.INT 15H:AH – 6FHSub-function:AL – 8 :Set the digital port as INPUTAL :Digital I/O input valueAssembly Language Sample 1MOV AX, 6F08H ;setting the digital port as inputINT 15H ;AL low byte = value