BU9458KV Application Note Rev. 0.02
PROPRIETARY AND CONFIDENTIAL
-
5/42-
2009/05/28
I. Introduction
This application note explains how to implement an audio player which is designed to play AAC/WMA/MP3 data written
to a USB memory or SD memory card, using BU9458KV in addition to a normal CD audio play set.
BU9458KV incorporates the following three operation modes: Standalone Mode (hereinafter referred to as MODE1)
which enables standalone operations such as “play” and “forward” using a KEY input function, Auto Slave Mode
(hereinafter referred to as MODE2) which is driven by sending a command, equivalent to a KEY input, from the master
micro controller, and Manual Slave Mode (hereinafter referred to as MODE3) which enables BU9458KV to send the
position of AAC/WMA/MP3 file within the memory device to the master micro controller using a I2C serial interface and
then, enables the master micro controller to directly specify the position of AAC/WMA/MP3 file to be played to
BU9458KV based on the received information. These modes allow BU9458KV to optimize functions fit to each audio
system.
It is preferable to refer to this application note to understand the operations and system of BU9458KV having the
above-mentioned functions and enhance functions of the audio set.
[Important]
The contents and software of this application note are given as examples of using the USB host AAC/WMA/MP3
decoder LSI. It is not given to guarantee the application itself.
Although the application note contains the command specifications, etc. possibly required at development of the above
system, make sure to read the BU9458KV function specifications for details.
