ymf781 Yamatake Corporation, ymf781 Datasheet - Page 5

• Manufacturer Part Number: ymf781
• Description: Apl-1 Automobile Sound Player-1
• Manufacturer: Yamatake Corporation

YMF781
■Overview of the Operation
Mobile phone
PC
Memory card
Wireless communication
Host CPU
APL-1 includes the Synthesizer Core, the CPU for control and its peripheral circuit.
The CPU controls most of the controls such as Synthesizer Core and Input/Output Port.
The sound contents are stored in the external ROM.
The download of the sound contents and the update of the APL-1 firmware are normally performed via the host CPU.
When it is difficult to mount a download function in host CPU, the download of sound contents and the update of the
firmware can be performed directly by using the asynchronous serial (UART). However, the connection destination is
restricted to PC Asynchronous Serial (UART).
Interface
Since the Synthesizer Core controls are all controlled by the built-in CPU, sound contents can be played by a simple
command from the external.
Since the sound contents support formats in SMAF, SMAF/Phrase and SMAF/Audio, ROM data can be created by the
development tool dedicated for APL-1.
The firmware in the built-in CPU is stored in the external ROM and can be updated by the exchange of ROM, or by
the download via the APL-1 Control Interface.
Likewise, for the sound contents, it can be updated by the exchange of ROM, or by the download via the APL-1
Control Interface.
APL-1 Control Interface: Clock Sync Serial, Asynchronous Serial (UART), is incorporated and can be selected by the
terminal. (Mode 1)
Device
Sound Contents
Sync Serial
Clock
UART
Note: A configuration diagram, which mode 1 is selected as an APL-1 Control Interface, is shown.
APL-1
Control CPU
Sound Contents
Built-in CPU firmware
Flash-ROM
or ROM
Synthesizer
（MA-5）
Core
+
Line out
Speaker
Output
AMP
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